relay: add zstd compression in weechat protocol

Option relay.network.compression_level is renamed to relay.network.compression
and is now a percentage between 0 (no compression) to 100 (best compression,
slowest).

Compression is now disabled by default in weechat protocol and must be enabled
via the `handshake` command (option `compression` has been removed from `init`
command).

36 files changed, 441 insertions, 870 deletions

diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index a608e855a..dd80f6246 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -35,7 +35,7 @@ jobs:
         sudo apt-add-repository --yes ppa:ondrej/php
         sudo apt-get update -qq
         sudo apt-get --yes purge php8.1-dev
-        sudo apt-get --yes --no-install-recommends install devscripts equivs python3-pip libenchant-dev autopoint cmake ninja-build lcov pkg-config libncursesw5-dev gem2deb libperl-dev python2-dev python3-dev libaspell-dev liblua5.3-dev tcl8.6-dev guile-2.0-dev libv8-dev libcurl4-gnutls-dev libgcrypt20-dev libgnutls28-dev zlib1g-dev curl libcpputest-dev php8.0-dev libphp8.0-embed libargon2-0-dev libsodium-dev pylint python3-bandit asciidoctor
+        sudo apt-get --yes --no-install-recommends install devscripts equivs python3-pip libenchant-dev autopoint cmake ninja-build lcov pkg-config libncursesw5-dev gem2deb libperl-dev python2-dev python3-dev libaspell-dev liblua5.3-dev tcl8.6-dev guile-2.0-dev libv8-dev libcurl4-gnutls-dev libgcrypt20-dev libgnutls28-dev libzstd-dev zlib1g-dev curl libcpputest-dev php8.0-dev libphp8.0-embed libargon2-0-dev libsodium-dev pylint python3-bandit asciidoctor
         sudo -H pip3 install --ignore-installed msgcheck
 
     - name: Test patches
diff --git a/CMakeLists.txt b/CMakeLists.txt
index e7a361d7c..0d1ba5aac 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -196,7 +196,10 @@ list(APPEND EXTRA_LIBS gnutls)
 
 # Check for zlib
 find_package(ZLIB REQUIRED)
-add_definitions(-DHAVE_ZLIB)
+
+# Check for zstd
+include(FindPkgConfig)
+pkg_check_modules(LIBZSTD REQUIRED libzstd)
 
 # Check for iconv
 find_package(Iconv)
diff --git a/ChangeLog.adoc b/ChangeLog.adoc
index fb4b547e9..25e68d79d 100644
--- a/ChangeLog.adoc
+++ b/ChangeLog.adoc
@@ -18,6 +18,10 @@ https://weechat.org/files/releasenotes/ReleaseNotes-devel.html[release notes]
 [[v3.5]]
 == Version 3.5 (under dev)
 
+New features::
+
+  * relay: add `zstd` (https://facebook.github.io/zstd/[Zstandard]) compression in weechat protocol, remove option `compression` from `init` command, rename option relay.network.compression_level to relay.network.compression
+
 Bug fixes::
 
   * irc: fix display of IRC numeric messages with no parameters
diff --git a/ReleaseNotes.adoc b/ReleaseNotes.adoc
index 2cf8ee423..a731ceefb 100644
--- a/ReleaseNotes.adoc
+++ b/ReleaseNotes.adoc
@@ -17,6 +17,31 @@ https://weechat.org/files/changelog/ChangeLog-devel.html[ChangeLog]
 (file _ChangeLog.adoc_ in sources).
 
 
+[[v3.5]]
+== Version 3.5 (under dev)
+
+[[v3.5_relay_weechat_compression_zstd]]
+=== Compression "zstandard" in relay
+
+Relay of type "weechat" now offers a compression with https://facebook.github.io/zstd/[Zstandard],
+which allows better compression and is much faster than zlib for both compression and decompression.
+
+The new compression type is `zstd`, and the default compression is now `off`
+instead of `zlib`: the compression must now be explicitly given in the
+link:https://weechat.org/doc/relay#command_handshake[handshake] command.
+
+The option `compression` in link:https://weechat.org/doc/relay#command_handshake[init]
+command has been removed, it is now ignored and must be given in the
+link:https://weechat.org/doc/relay#command_handshake[handshake] command
+(it was deprecated since WeeChat 2.9).
+
+The option relay.network.compression_level has been renamed to relay.network.compression
+and is now a percentage between `0` and `100`:
+
+* `0`: disable compression
+* `1`: low compression (fast)
+* `100`: best compression (slow)
+
 [[v3.4]]
 == Version 3.4 (2021-12-18)
 
diff --git a/configure.ac b/configure.ac
index 75fa0b47f..bfb6d7234 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1176,6 +1176,27 @@ else
 fi
 
 # ------------------------------------------------------------------------------
+#                                     zstd
+# ------------------------------------------------------------------------------
+
+AC_CHECK_HEADER(zstd.h,ac_found_zstd_header="yes",ac_found_zstd_header="no")
+AC_CHECK_LIB(zstd,ZSTD_compress,ac_found_zstd_lib="yes",ac_found_zstd_lib="no")
+
+AC_MSG_CHECKING(for zstd headers and libraries)
+if test "x$ac_found_zstd_header" = "xno" -o "x$ac_found_zstd_lib" = "xno" ; then
+    AC_MSG_RESULT(no)
+    AC_MSG_ERROR([
+*** zstd was not found. You may want to get it from https://github.com/facebook/zstd
+*** or try to install it with your software package manager.])
+else
+    AC_MSG_RESULT(yes)
+    ZSTD_CFLAGS=`pkg-config libzstd --cflags`
+    ZSTD_LFLAGS=`pkg-config libzstd --libs`
+    AC_SUBST(ZSTD_CFLAGS)
+    AC_SUBST(ZSTD_LFLAGS)
+fi
+
+# ------------------------------------------------------------------------------
 #                                     curl
 # ------------------------------------------------------------------------------
 
diff --git a/debian-devel/control b/debian-devel/control
index 31e09cccd..6cc1b8c92 100644
--- a/debian-devel/control
+++ b/debian-devel/control
@@ -19,6 +19,7 @@ Build-Depends:
     libcurl4-gnutls-dev,
     libgcrypt20-dev,
     libgnutls28-dev,
+    libzstd-dev,
     zlib1g-dev
 Standards-Version: 4.6.0.1
 Homepage: https://weechat.org/
diff --git a/debian-stable/control b/debian-stable/control
index a4a515ac4..77c78e4ad 100644
--- a/debian-stable/control
+++ b/debian-stable/control
@@ -19,6 +19,7 @@ Build-Depends:
     libcurl4-gnutls-dev,
     libgcrypt20-dev,
     libgnutls28-dev,
+    libzstd-dev,
     zlib1g-dev
 Standards-Version: 4.6.0.1
 Homepage: https://weechat.org/
diff --git a/doc/de/weechat_user.de.adoc b/doc/de/weechat_user.de.adoc
index 0747034af..27d92319c 100644
--- a/doc/de/weechat_user.de.adoc
+++ b/doc/de/weechat_user.de.adoc
@@ -107,9 +107,12 @@ WeeChat *erforderlich* sind:
 | pkg-config             |               | entdeckt installierte Bibliotheken.
 | libncursesw5-dev ^(2)^ |               | Ncurses Oberfläche.
 | libcurl4-gnutls-dev    |               | URL Transfer.
-| zlib1g-dev             |               | Kompression für Pakete, die mittels Relay- (WeeChat Protokoll), Script-Erweiterung übertragen werden.
 | libgcrypt20-dev        |               | Geschützte Daten, IRC SASL Authentifikation.
 | libgnutls28-dev        | ≥ 2.2.0 ^(3)^ | SSL Verbindung zu einem IRC Server, Unterstützung von SSL in der Relay-Erweiterung, IRC SASL Authentifikation (ECDSA-NIST256P-CHALLENGE).
+// TRANSLATION MISSING
+| zlib1g-dev             |               | Compression of messages (WeeChat -> client) with https://zlib.net/[zlib] in relay plugin (weechat protocol), Script-Erweiterung übertragen werden.
+// TRANSLATION MISSING
+| libzstd-dev            |               | Compression of messages (WeeChat -> client) with https://facebook.github.io/zstd/[Zstandard] in relay plugin (weechat protocol).
 |===
 
 [NOTE]
diff --git a/doc/en/weechat_relay_protocol.en.adoc b/doc/en/weechat_relay_protocol.en.adoc
index 33ac9f14c..683a72c39 100644
--- a/doc/en/weechat_relay_protocol.en.adoc
+++ b/doc/en/weechat_relay_protocol.en.adoc
@@ -103,7 +103,7 @@ List of available commands (detail in next chapters):
 [[command_handshake]]
 === handshake
 
-_WeeChat ≥ 2.9._
+_WeeChat ≥ 2.9, updated in version 3.5._
 
 Perform an handshake between the client and WeeChat: this is required in most
 cases to know the session settings and prepare the authentication with the
@@ -127,10 +127,15 @@ Arguments:
 *** _sha512_: password salted and hashed with SHA512 algorithm
 *** _pbkdf2+sha256_: password salted and hashed with PBKDF2 algorithm (using SHA256 hash)
 *** _pbkdf2+sha512_: password salted and hashed with PBKDF2 algorithm (using SHA512 hash)
-** _compression_: compression type:
-*** _zlib_: enable _zlib_ compression for messages sent by _relay_
-    (enabled by default if _relay_ supports _zlib_ compression)
-*** _off_: disable compression
+** _compression_: list of supported compression types supported by the client
+   (separated by colons and sorted from most important to the fallback value);
+   if compression is enabled, messages from _relay_ to client are compressed
+   to save bandwidth; allowed values are:
+*** _off_: no compression (default if option is not given)
+*** _zlib_: compress with https://zlib.net/[zlib] _(WeeChat ≥ 0.3.7)_
+*** _zstd_: compress with https://facebook.github.io/zstd/[Zstandard]: better
+    compression and much faster than _zlib_ for both compression and decompression
+    _(WeeChat ≥ 3.5)_
 
 Notes about option _password_hash_algo_:
 
@@ -169,8 +174,9 @@ WeeChat replies with a hashtable containing the following keys and values:
   and the user password (the _relay_ nonce + the client nonce is the salt used
   in the password hash algorithm)
 * _compression_: compression type:
-** _zlib_: messages are compressed with _zlib_
 ** _off_: messages are not compressed
+** _zlib_: messages are compressed with https://zlib.net/[zlib]
+** _zstd_: messages are compressed with https://facebook.github.io/zstd/[Zstandard]
 
 [TIP]
 With WeeChat ≤ 2.8, the command _handshake_ is not implemented, WeeChat silently
@@ -196,7 +202,7 @@ htb: {
     'password_hash_iterations': '100000',
     'totp': 'on',
     'nonce': '85B1EE00695A5B254E14F4885538DF0D',
-    'compression': 'zlib',
+    'compression': 'off',
 }
 ----
 
@@ -216,7 +222,7 @@ htb: {
     'password_hash_iterations': '100000',
     'totp': 'on',
     'nonce': '85B1EE00695A5B254E14F4885538DF0D',
-    'compression': 'zlib',
+    'compression': 'off',
 }
 ----
 
@@ -236,7 +242,7 @@ htb: {
     'password_hash_iterations': '100000',
     'totp': 'on',
     'nonce': '85B1EE00695A5B254E14F4885538DF0D',
-    'compression': 'zlib',
+    'compression': 'off',
 }
 ----
 
@@ -248,10 +254,11 @@ the password is "test" in this example:
 init password_hash=pbkdf2+sha256:85b1ee00695a5b254e14f4885538df0da4b73207f5aae4:100000:ba7facc3edb89cd06ae810e29ced85980ff36de2bb596fcf513aaab626876440
 ----
 
-* Only "sha256" and "sha512" are supported by the client, disable compression:
+* Only "sha256" and "sha512" are supported by the client, enable zstd (preferred)
+or zlib compression:
 
 ----
-(handshake) handshake password_hash_algo=sha256:sha512,compression=off
+(handshake) handshake password_hash_algo=sha256:sha512,compression=zstd:zlib
 ----
 
 Response:
@@ -264,7 +271,7 @@ htb: {
     'password_hash_iterations': '100000',
     'totp': 'on',
     'nonce': '85B1EE00695A5B254E14F4885538DF0D',
-    'compression': 'off',
+    'compression': 'zstd',
 }
 ----
 
@@ -298,12 +305,6 @@ Arguments:
    factor, in addition to the password
    (option _relay.network.totp_secret_ in WeeChat)
    _(WeeChat ≥ 2.4)_
-** _compression_: compression type (*deprecated* since version 2.9, it is kept
-   for compatibility reasons but should be sent in the
-   <<command_handshake,handshake command>>):
-*** _zlib_: enable _zlib_ compression for messages sent by _relay_
-    (enabled by default if _relay_ supports _zlib_ compression)
-*** _off_: disable compression
 
 [NOTE]
 With WeeChat ≥ 1.6, commas can be escaped in the value, for example
@@ -1379,7 +1380,8 @@ Messages are sent as binary data, using following format (with size in bytes):
   (including this field)
 * _compression_ (byte): flag:
 ** _0x00_: following data is not compressed
-** _0x01_: following data is compressed with _zlib_
+** _0x01_: following data is compressed with https://zlib.net/[zlib]
+** _0x02_: following data is compressed with https://facebook.github.io/zstd/[Zstandard]
 * _id_ (string, 4 bytes + content): identifier sent by client (before command name); it can be
   empty (string with zero length and no content) if no identifier was given in
   command
@@ -1389,8 +1391,9 @@ Messages are sent as binary data, using following format (with size in bytes):
 [[message_compression]]
 === Compression
 
-If flag _compression_ is equal to 0x01, then *all* data after is compressed
-with _zlib_, and therefore must be uncompressed before being processed.
+If flag _compression_ is equal to 0x01 or 0x02, then *all* data after is compressed
+with https://zlib.net/[zlib] or https://facebook.github.io/zstd/[Zstandard],
+and therefore must be uncompressed before being processed.
 
 [[message_identifier]]
 === Identifier
diff --git a/doc/en/weechat_user.en.adoc b/doc/en/weechat_user.en.adoc
index d7d3b6fbf..98bb045d1 100644
--- a/doc/en/weechat_user.en.adoc
+++ b/doc/en/weechat_user.en.adoc
@@ -101,9 +101,10 @@ WeeChat:
 | pkg-config             |               | Detect installed libraries.
 | libncursesw5-dev ^(2)^ |               | Ncurses interface.
 | libcurl4-gnutls-dev    |               | URL transfer.
-| zlib1g-dev             |               | Compression of packets in relay plugin (weechat protocol), script plugin.
 | libgcrypt20-dev        |               | Secured data, IRC SASL authentication.
 | libgnutls28-dev        | ≥ 2.2.0 ^(3)^ | SSL connection to IRC server, support of SSL in relay plugin, IRC SASL authentication (ECDSA-NIST256P-CHALLENGE).
+| zlib1g-dev             |               | Compression of messages (WeeChat -> client) with https://zlib.net/[zlib] in relay plugin (weechat protocol), script plugin.
+| libzstd-dev            |               | Compression of messages (WeeChat -> client) with https://facebook.github.io/zstd/[Zstandard] in relay plugin (weechat protocol).
 |===
 
 [NOTE]
diff --git a/doc/fr/weechat_relay_protocol.fr.adoc b/doc/fr/weechat_relay_protocol.fr.adoc
index bcca20f81..51a5b7e13 100644
--- a/doc/fr/weechat_relay_protocol.fr.adoc
+++ b/doc/fr/weechat_relay_protocol.fr.adoc
@@ -24,7 +24,7 @@ Les termes suivants sont utilisés dans ce document :
 * _relay_ : il s'agit de l'extension "relay" de WeeChat, qui agit comme un
   "serveur" et autorise les _clients_ à se connecter
 * _client_ : il s'agit d'un autre logiciel, connecté au _relay_ via une
-  connexion réseau; dans la plupart des cas, ce _client_ est une interface
+  connexion réseau ; dans la plupart des cas, ce _client_ est une interface
   distante.
 
 [[network_diagram]]
@@ -79,7 +79,7 @@ Les commandes ont le format :
 Les champs sont :
 
 * _id_ : identifiant du message (facultatif) qui sera envoyée dans la réponse de
-  _relay_; elle doit être entre parenthèses, et ne doit pas commencer par un
+  _relay_ ; elle doit être entre parenthèses, et ne doit pas commencer par un
   underscore (les identifiants commençant par un underscore sont réservés
   pour les messages _évènements_ de WeeChat)
 * _commande_ : une commande (voir le tableau ci-dessous)
@@ -107,7 +107,7 @@ Liste des commandes disponibles (détail dans les chapitres suivants) :
 [[command_handshake]]
 === handshake
 
-_WeeChat ≥ 2.9._
+_WeeChat ≥ 2.9, mis à jour dans la version 3.5._
 
 Effectuer une poignée de main entre le client et WeeChat : cela est obligatoire
 dans la plupart des cas pour connaître les paramètres de la session et préparer
@@ -133,10 +133,16 @@ Paramètres :
     (avec un hachage SHA256)
 *** _pbkdf2+sha512_ : mot de passe salé et haché avec l'algorithme PBKDF2
     (avec un hachage SHA512)
-** _compression_ : type de compression :
-*** _zlib_ : activer la compression _zlib_ pour les messages envoyés par _relay_
-    (activée par défaut si _relay_ supporte la compression _zlib_)
-*** _off_ : désactiver la compression
+** _compression_ : liste des types de compression supportées par le client
+   (séparées par des deux-points et triées de la plus importante à la valeur
+   par défaut) ; si la compression est activée, les messages de _relay_ vers
+   le client sont compressés pour économiser de la bande passante ;
+   les valeurs autorisées sont :
+*** _off_ : pas de compression (par défaut si l'option n'est pas donnée)
+*** _zlib_ : compresser avec https://zlib.net/[zlib] _(WeeChat ≥ 0.3.7)_
+*** _zstd_ : compresser avec https://facebook.github.io/zstd/[Zstandard] :
+    meilleure compression et bien plus rapide que _zlib_ pour la compression et
+    la décompression _(WeeChat ≥ 3.5)_
 
 Notes à propos de l'option _password_hash_algo_ :
 
@@ -178,8 +184,9 @@ suivantes :
   _relay_ + le nonce client constituent le sel utilisé dans l'algorithme de
   hachage du mot de passe)
 * _compression_ : type de compression :
-** _zlib_ : les messages sont compressés avec _zlib_
 ** _off_ : les messages ne sont pas compressés
+** _zlib_ : les messages sont compressés avec https://zlib.net/[zlib]
+** _zstd_ : les messages sont compressés avec https://facebook.github.io/zstd/[Zstandard]
 
 [TIP]
 Avec WeeChat ≤ 2.8, la commande _handshake_ n'est pas implémentée, WeeChat ignore
@@ -204,7 +211,7 @@ htb: {
     'password_hash_iterations': '100000',
     'totp': 'on',
     'nonce': '85B1EE00695A5B254E14F4885538DF0D',
-    'compression': 'zlib',
+    'compression': 'off',
 }
 ----
 
@@ -224,7 +231,7 @@ htb: {
     'password_hash_iterations': '100000',
     'totp': 'on',
     'nonce': '85B1EE00695A5B254E14F4885538DF0D',
-    'compression': 'zlib',
+    'compression': 'off',
 }
 ----
 
@@ -244,7 +251,7 @@ htb: {
     'password_hash_iterations': '100000',
     'totp': 'on',
     'nonce': '85B1EE00695A5B254E14F4885538DF0D',
-    'compression': 'zlib',
+    'compression': 'off',
 }
 ----
 
@@ -256,10 +263,11 @@ le mot de passe est "test" dans cet exemple :
 init password_hash=pbkdf2+sha256:85b1ee00695a5b254e14f4885538df0da4b73207f5aae4:100000:ba7facc3edb89cd06ae810e29ced85980ff36de2bb596fcf513aaab626876440
 ----
 
-* Seulement "sha256" et "sha512" sont supportés par le client, désactiver la compression :
+* Seulement "sha256" et "sha512" sont supportés par le client, activer la
+compression zstd (préférée) ou zlib :
 
 ----
-(handshake) handshake password_hash_algo=sha256:sha512,compression=off
+(handshake) handshake password_hash_algo=sha256:sha512,compression=zstd:zlib
 ----
 
 Réponse :
@@ -272,7 +280,7 @@ htb: {
     'password_hash_iterations': '100000',
     'totp': 'on',
     'nonce': '85B1EE00695A5B254E14F4885538DF0D',
-    'compression': 'off',
+    'compression': 'zstd',
 }
 ----
 
@@ -306,12 +314,6 @@ Paramètres :
    One-Time Password) utilisé comme second facteur d'authentification, en plus
    du mot de passe (option _relay.network.totp_secret_ dans WeeChat)
    _(WeeChat ≥ 2.4)_
-** _compression_ : type de compression (*obsolète* depuis la version 2.9, gardé
-   pour des raisons de compatibilité mais devrait être envoyé dans la
-   <<command_handshake,commande handshake>>) :
-*** _zlib_ : activer la compression _zlib_ pour les messages envoyés par _relay_
-    (activée par défaut si _relay_ supporte la compression _zlib_)
-*** _off_ : désactiver la compression
 
 [NOTE]
 Avec WeeChat ≥ 1.6, les virgules peuvent être échappées dans la valeur,
@@ -1157,16 +1159,16 @@ Syntaxe :
 Paramètres :
 
 * _tampon_ : pointeur (par exemple : "0x1234abcd") ou nom complet du tampon (par exemple :
-  _core.weechat_ ou _irc.libera.#weechat_); le nom "*" peut être utilisé pour
+  _core.weechat_ ou _irc.libera.#weechat_) ; le nom "*" peut être utilisé pour
   spécifier tous les tampons
 * _options_ : un ou plusieurs mots-clés, séparés par des virgules (par défaut
   _buffers,upgrade,buffer,nicklist_ pour "*" et _buffer,nicklist_ pour un
   tampon) :
 ** _buffers_ : recevoir les signaux à propos des tampons (ouverts/fermés,
-   déplacés, renommés, mélangés, masqués/démasqués); peut être utilisé seulement
+   déplacés, renommés, mélangés, masqués/démasqués) ; peut être utilisé seulement
    avec "*" _(WeeChat ≥ 0.4.1)_
 ** _upgrade_ : recevoir les signaux à propos de la mise à jour de WeeChat
-   (mise à jour, fin de mise à jour); peut être utilisé seulement avec "*"
+   (mise à jour, fin de mise à jour) ; peut être utilisé seulement avec "*"
    _(WeeChat ≥ 0.4.1)_
 ** _buffer_ : recevoir les signaux à propos du tampon (nouvelles lignes, type
    changé, titre changé, variable locale ajoutée/supprimée, et les même signaux
@@ -1225,11 +1227,11 @@ Syntaxe :
 Paramètres :
 
 * _tampon_ : pointeur (par exemple : "0x1234abcd") ou nom complet du tampon (par exemple :
-  _core.weechat_ ou _irc.libera.#weechat_); le nom "*" peut être utilisé pour
+  _core.weechat_ ou _irc.libera.#weechat_) ; le nom "*" peut être utilisé pour
   spécifier tous les tampons
 * _options_ : un ou plusieurs mots-clés, séparés par des virgules (le défaut est
   _buffers,upgrade,buffer,nicklist_ pour "*" et _buffer,nicklist_ pour un
-  tampon); voir <<command_sync,la commande sync>> pour les valeurs
+  tampon) ; voir <<command_sync,la commande sync>> pour les valeurs
 
 [NOTE]
 En utilisant le tampon "*", les autres tampons synchronisés (en utilisant un
@@ -1399,9 +1401,10 @@ suivant (avec la taille en octets) :
   (en incluant ce champ)
 * _compression_ (octet) : drapeau :
 ** _0x00_ : les données qui suivent ne sont pas compressées
-** _0x01_ : les données qui suivent sont compressées avec _zlib_
+** _0x01_ : les données qui suivent sont compressées avec https://zlib.net/[zlib]
+** _0x02_ : les données qui suivent sont compressées avec https://facebook.github.io/zstd/[Zstandard]
 * _id_ (chaîne, 4 octets + contenu) : l'identifiant envoyé par le client
-  (avant le nom de la commande); il peut être vide (chaîne avec une longueur
+  (avant le nom de la commande) ; il peut être vide (chaîne avec une longueur
   de zéro sans contenu) si l'identifiant n'était pas donné dans la commande
 * _type_ (3 caractères) : un type : 3 lettres (voir le tableau ci-dessous)
 * _objet_ : un objet (voir tableau ci-dessous)
@@ -1409,9 +1412,9 @@ suivant (avec la taille en octets) :
 [[message_compression]]
 === Compression
 
-Si le drapeau de _compression_ est égal à 0x01, alors *toutes* les données après
-sont compressées avec _zlib_, et par conséquent doivent être décompressées avant
-d'être utilisées.
+Si le drapeau de _compression_ est égal à 0x01 ou 0x02, alors *toutes* les données
+après sont compressées avec https://zlib.net/[zlib] ou https://facebook.github.io/zstd/[Zstandard],
+et par conséquent doivent être décompressées avant d'être utilisées.
 
 [[message_identifier]]
 === Identifiant
@@ -2473,7 +2476,7 @@ Une chaîne _NULL_ (pointeur NULL en C) a une longueur de -1 :
 [[object_buffer]]
 ==== Tampon de données
 
-Même format que l'objet <<object_string,chaîne>>; le contenu est simplement un
+Même format que l'objet <<object_string,chaîne>> ; le contenu est simplement un
 tableau d'octets.
 
 [[object_pointer]]
@@ -2556,7 +2559,7 @@ objets).
 ....
 
 * _h-path_ (chaîne) : chemin utilise pour atteindre le hdata (exemple :
-  _buffer/lines/line/line_data_); le dernier élément du chemin est le hdata
+  _buffer/lines/line/line_data_) ; le dernier élément du chemin est le hdata
   retourné
 * _keys_ (chaînes) : chaîne avec une liste de _clé:type_ (séparés par des
   virgules), exemple : _number:int,name:str_
diff --git a/doc/fr/weechat_user.fr.adoc b/doc/fr/weechat_user.fr.adoc
index 48949e51f..dfcbfe7cb 100644
--- a/doc/fr/weechat_user.fr.adoc
+++ b/doc/fr/weechat_user.fr.adoc
@@ -104,9 +104,10 @@ Le tableau suivant liste les paquets *requis* pour compiler WeeChat :
 | pkg-config             |               | Détection des bibliothèques installées.
 | libncursesw5-dev ^(2)^ |               | Interface ncurses.
 | libcurl4-gnutls-dev    |               | Transfert d'URL.
-| zlib1g-dev             |               | Compression des paquets dans l'extension relay (protocole weechat), extension script.
 | libgcrypt20-dev        |               | Données sécurisées, authentification IRC SASL.
 | libgnutls28-dev        | ≥ 2.2.0 ^(3)^ | Connexion SSL au serveur IRC, support SSL dans l'extension relay, authentification IRC SASL (ECDSA-NIST256P-CHALLENGE).
+| zlib1g-dev             |               | Compression des messages (WeeChat -> client) avec https://zlib.net/[zlib] dans l'extension relay (protocole weechat), extension script.
+| libzstd-dev            |               | Compression des messages (WeeChat -> client) avec https://facebook.github.io/zstd/[Zstandard] dans l'extension relay (protocole weechat).
 |===
 
 [NOTE]
diff --git a/doc/it/weechat_user.it.adoc b/doc/it/weechat_user.it.adoc
index c3e1602dc..6c5406d08 100644
--- a/doc/it/weechat_user.it.adoc
+++ b/doc/it/weechat_user.it.adoc
@@ -122,11 +122,13 @@ WeeChat:
 | libncursesw5-dev ^(2)^ |               | Interfaccia ncurses.
 | libcurl4-gnutls-dev    |               | Trasferimento URL.
 // TRANSLATION MISSING
-| zlib1g-dev             |               | Compression of packets in relay plugin (weechat protocol), script plugin.
-// TRANSLATION MISSING
 | libgcrypt20-dev        |               | Secured data, IRC SASL authentication.
 // TRANSLATION MISSING
 | libgnutls28-dev        | ≥ 2.2.0 ^(3)^ | Connessione SSL al server IRC, support of SSL in relay plugin, IRC SASL authentication (ECDSA-NIST256P-CHALLENGE).
+// TRANSLATION MISSING
+| zlib1g-dev             |               | Compression of messages (WeeChat -> client) with https://zlib.net/[zlib] in relay plugin (weechat protocol), script plugin.
+// TRANSLATION MISSING
+| libzstd-dev            |               | Compression of messages (WeeChat -> client) with https://facebook.github.io/zstd/[Zstandard] in relay plugin (weechat protocol).
 |===
 
 [NOTE]
diff --git a/doc/ja/weechat_relay_protocol.ja.adoc b/doc/ja/weechat_relay_protocol.ja.adoc
index e004d5221..ab4833517 100644
--- a/doc/ja/weechat_relay_protocol.ja.adoc
+++ b/doc/ja/weechat_relay_protocol.ja.adoc
@@ -112,7 +112,7 @@ _リレー_ プラグインは _IRC プロキシ_ のように振舞います (�
 [[command_handshake]]
 === handshake
 
-_WeeChat ≥ 2.9._
+_WeeChat ≥ 2.9, updated in version 3.5._
 
 Perform an handshake between the client and WeeChat: this is required in most
 cases to know the session settings and prepare the authentication with the
@@ -136,10 +136,16 @@ Arguments:
 *** _sha512_: password salted and hashed with SHA512 algorithm
 *** _pbkdf2+sha256_: password salted and hashed with PBKDF2 algorithm (using SHA256 hash)
 *** _pbkdf2+sha512_: password salted and hashed with PBKDF2 algorithm (using SHA512 hash)
-** _compression_: compression type:
-*** _zlib_: enable _zlib_ compression for messages sent by _relay_
-    (enabled by default if _relay_ supports _zlib_ compression)
-*** _off_: disable compression
+// TRANSLATION MISSING
+** _compression_: list of supported compression types supported by the client
+   (separated by colons and sorted from most important to the fallback value);
+   if compression is enabled, messages from _relay_ to client are compressed
+   to save bandwidth; allowed values are:
+*** _off_: no compression (default if option is not given)
+*** _zlib_: compress with https://zlib.net/[zlib] _(WeeChat ≥ 0.3.7)_
+*** _zstd_: compress with https://facebook.github.io/zstd/[Zstandard]: better
+    compression and much faster than _zlib_ for both compression and decompression
+    _(WeeChat ≥ 3.5)_
 
 Notes about option _password_hash_algo_:
 
@@ -178,8 +184,9 @@ WeeChat replies with a hashtable containing the following keys and values:
   and the user password (the _relay_ nonce + the client nonce is the salt used
   in the password hash algorithm)
 * _compression_: compression type:
-** _zlib_: messages are compressed with _zlib_
 ** _off_: messages are not compressed
+** _zlib_: messages are compressed with https://zlib.net/[zlib]
+** _zstd_: messages are compressed with https://facebook.github.io/zstd/[Zstandard]
 
 [TIP]
 With WeeChat ≤ 2.8, the command _handshake_ is not implemented, WeeChat silently
@@ -205,7 +212,7 @@ htb: {
     'password_hash_iterations': '100000',
     'totp': 'on',
     'nonce': '85B1EE00695A5B254E14F4885538DF0D',
-    'compression': 'zlib',
+    'compression': 'off',
 }
 ----
 
@@ -225,7 +232,7 @@ htb: {
     'password_hash_iterations': '100000',
     'totp': 'on',
     'nonce': '85B1EE00695A5B254E14F4885538DF0D',
-    'compression': 'zlib',
+    'compression': 'off',
 }
 ----
 
@@ -245,7 +252,7 @@ htb: {
     'password_hash_iterations': '100000',
     'totp': 'on',
     'nonce': '85B1EE00695A5B254E14F4885538DF0D',
-    'compression': 'zlib',
+    'compression': 'off',
 }
 ----
 
@@ -257,10 +264,11 @@ the password is "test" in this example:
 init password_hash=pbkdf2+sha256:85b1ee00695a5b254e14f4885538df0da4b73207f5aae4:100000:ba7facc3edb89cd06ae810e29ced85980ff36de2bb596fcf513aaab626876440
 ----
 
-* Only "sha256" and "sha512" are supported by the client, disable compression:
+* Only "sha256" and "sha512" are supported by the client, enable zstd (preferred)
+or zlib compression:
 
 ----
-(handshake) handshake password_hash_algo=sha256:sha512,compression=off
+(handshake) handshake password_hash_algo=sha256:sha512,compression=zstd:zlib
 ----
 
 Response:
@@ -273,7 +281,7 @@ htb: {
     'password_hash_iterations': '100000',
     'totp': 'on',
     'nonce': '85B1EE00695A5B254E14F4885538DF0D',
-    'compression': 'off',
+    'compression': 'zstd',
 }
 ----
 
@@ -310,13 +318,6 @@ _handshake_), without warning.
 ** _totp_: パスワードに加えた二要素認証で利用する時間ベースのワンタイムパスワード (TOTP)
    (WeeChat の _relay.network.totp_secret_ オプション)
    _(WeeChat バージョン 2.4 で利用可能)_
-// TRANSLATION MISSING
-** _compression_: 圧縮タイプ (*deprecated* since version 2.9, it is kept
-   for compatibility reasons but should be sent in the
-   <<command_handshake,handshake command>>):
-*** _zlib_: _リレー_ から受信するメッセージに対して _zlib_ 圧縮を使う
-    (_リレー_ が _zlib_ 圧縮をサポートしている場合、デフォルトで有効化されます)
-*** _off_: 圧縮を使わない
 
 [NOTE]
 WeeChat バージョン 1.6 以上の場合、コンマをエスケープすることで value にコンマを設定可能です。例えば
@@ -1409,7 +1410,8 @@ quit
   (このフィールドを含む)
 * _compression_ (バイト型): フラグ:
 ** _0x00_: これ以降のデータは圧縮されていません
-** _0x01_: これ以降のデータは _zlib_ で圧縮されています
+** _0x01_: これ以降のデータは https://zlib.net/[zlib] で圧縮されています
+** _0x02_: これ以降のデータは https://facebook.github.io/zstd/[Zstandard] で圧縮されています
 * _id_ (文字列型、4 バイト + 内容): クライアントが送信した識別子 (コマンド名の前につけられる);
   コマンドに識別子が含まれない場合は空文字列でも可
   (内容を含まない長さゼロの文字列)
@@ -1419,8 +1421,10 @@ quit
 [[message_compression]]
 === 圧縮
 
-_compression_ フラグが 0x01 の場合、これ以降の *全ての* データは _zlib_
-で圧縮されているため、処理前に必ず展開してください。
+// TRANSLATION MISSING
+If flag _compression_ is equal to 0x01 or 0x02, then *all* data after is compressed
+with https://zlib.net/[zlib] or https://facebook.github.io/zstd/[Zstandard],
+and therefore must be uncompressed before being processed.
 
 [[message_identifier]]
 === 識別子
diff --git a/doc/ja/weechat_user.ja.adoc b/doc/ja/weechat_user.ja.adoc
index 61be32a7d..7b33ff049 100644
--- a/doc/ja/weechat_user.ja.adoc
+++ b/doc/ja/weechat_user.ja.adoc
@@ -108,9 +108,12 @@ WeeChat:
 | pkg-config             |                  | インストール済みライブラリを検出
 | libncursesw5-dev ^(2)^ |                  | ncurses インターフェース
 | libcurl4-gnutls-dev    |                  | URL 転送
-| zlib1g-dev             |                  | relay プラグインでパケットを圧縮 (weechat プロトコル)、スクリプトプラグイン
 | libgcrypt20-dev        |                  | 保護データ、IRC SASL 認証
 | libgnutls28-dev        | 2.2.0 以上 ^(3)^ | IRC サーバへの SSL 接続、IRC SASL 認証 (ECDSA-NIST256P-CHALLENGE)
+// TRANSLATION MISSING
+| zlib1g-dev             |                  | Compression of messages (WeeChat -> client) with https://zlib.net/[zlib] in relay plugin (weechat protocol), script plugin.
+// TRANSLATION MISSING
+| libzstd-dev            |                  | Compression of messages (WeeChat -> client) with https://facebook.github.io/zstd/[Zstandard] in relay plugin (weechat protocol).
 |===
 
 [NOTE]
diff --git a/doc/pl/weechat_user.pl.adoc b/doc/pl/weechat_user.pl.adoc
index 4fc43dc08..61ed32766 100644
--- a/doc/pl/weechat_user.pl.adoc
+++ b/doc/pl/weechat_user.pl.adoc
@@ -107,9 +107,12 @@ WeeChat:
 | pkg-config             |               | Wykrywa zainstalowane biblioteki.
 | libncursesw5-dev ^(2)^ |               | Interfejs ncurses.
 | libcurl4-gnutls-dev    |               | Transfer URL.
-| zlib1g-dev             |               | Kompresja pakietów we wtyczce relay (protokół weechat), wtyczka script.
 | libgcrypt20-dev        |               | Zabezpieczone dane, uwierzytelnianie IRC SASL.
 | libgnutls28-dev        | ≥ 2.2.0 ^(3)^ | Połączenia SSL z serwerami IRC, wsparcie dla SSL we wtyczce relay, uwierzytelnianie IRC SASL (ECDSA-NIST256P-CHALLENGE).
+// TRANSLATION MISSING
+| zlib1g-dev             |               | Compression of messages (WeeChat -> client) with https://zlib.net/[zlib] in relay plugin (weechat protocol), script plugin.
+// TRANSLATION MISSING
+| libzstd-dev            |               | Compression of messages (WeeChat -> client) with https://facebook.github.io/zstd/[Zstandard] in relay plugin (weechat protocol).
 |===
 
 [NOTE]
diff --git a/doc/sr/weechat_relay_protocol.sr.adoc b/doc/sr/weechat_relay_protocol.sr.adoc
index 3f9856460..fbf67e515 100644
--- a/doc/sr/weechat_relay_protocol.sr.adoc
+++ b/doc/sr/weechat_relay_protocol.sr.adoc
@@ -97,7 +97,8 @@ _клијенти_ су повезани са _релејем_ као што ј�
 [[command_handshake]]
 === handshake
 
-_WeeChat ≥ 2.9._
+// TRANSLATION MISSING
+_WeeChat ≥ 2.9, updated in version 3.5._
 
 Извршава руковање између клијента и програма WeeChat: ово је у већини случајева неопходно како би се сазнале поставке сесије и припремила аутентификација командом _init_.
 
@@ -118,9 +119,16 @@ _WeeChat ≥ 2.9._
 *** _sha512_: лозинка засољена и хеширана SHA512 алгоритмом
 *** _pbkdf2+sha256_: лозинка засољена и хеширана PBKDF2 алгоритмом (користећи SHA256 хеш)
 *** _pbkdf2+sha512_: лозинка засољена и хеширана PBKDF2 алгоритмом (користећи SHA512 хеш)
-** _compression_: тип компресије:
-*** _zlib_: укључује _zlib_ компресију порука које шаље _релеј_ (подразумевано је укључено ако _релеј_ подржава _zlib_ компресију)
-*** _off_: искључује компресију
+// TRANSLATION MISSING
+** _compression_: list of supported compression types supported by the client
+   (separated by colons and sorted from most important to the fallback value);
+   if compression is enabled, messages from _relay_ to client are compressed
+   to save bandwidth; allowed values are:
+*** _off_: no compression (default if option is not given)
+*** _zlib_: compress with https://zlib.net/[zlib] _(WeeChat ≥ 0.3.7)_
+*** _zstd_: compress with https://facebook.github.io/zstd/[Zstandard]: better
+    compression and much faster than _zlib_ for both compression and decompression
+    _(WeeChat ≥ 3.5)_
 
 Напомене у вези опције _password_hash_algo_:
 
@@ -147,8 +155,9 @@ _WeeChat ≥ 2.9._
 ** _off_: Time-based One-Time Password (TOTP) је искључена и није потребна у _init_ команди
 * _nonce_: бафер бајтова који не могу да се предвиде, послат као хексадецимална вредност, којом се спречавају replay напади; ако је _password_hash_algo_ хеш алгоритам, клијент мора да израчуна хеш лозинке над овим нонсом, спојено са клијентовим нонсом и корисничком лозинком (_релеј_ нонс + _клијент_ нонс је со која се користи у алгоритму хеширања лозинке)
 * _compression_: тип компресије:
-** _zlib_: поруке су компресоване са _zlib_
 ** _off_: поруке се не компресују
+** _zlib_: поруке су компресоване са https://zlib.net/[zlib]
+** _zstd_: поруке су компресоване са https://facebook.github.io/zstd/[Zstandard]
 
 [TIP]
 У програму WeeChat верзије ≤ 2.8, команда _handshake_ није имплементирана, програм WeeChat једноставно игнорише ову команду, чак и ако се пошаље пре _init_ команде. +
@@ -172,7 +181,7 @@ htb: {
     'password_hash_iterations': '100000',
     'totp': 'on',
     'nonce': '85B1EE00695A5B254E14F4885538DF0D',
-    'compression': 'zlib',
+    'compression': 'off',
 }
 ----
 
@@ -192,7 +201,7 @@ htb: {
     'password_hash_iterations': '100000',
     'totp': 'on',
     'nonce': '85B1EE00695A5B254E14F4885538DF0D',
-    'compression': 'zlib',
+    'compression': 'off',
 }
 ----
 
@@ -212,7 +221,7 @@ htb: {
     'password_hash_iterations': '100000',
     'totp': 'on',
     'nonce': '85B1EE00695A5B254E14F4885538DF0D',
-    'compression': 'zlib',
+    'compression': 'off',
 }
 ----
 
@@ -222,10 +231,12 @@ htb: {
 init password_hash=pbkdf2+sha256:85b1ee00695a5b254e14f4885538df0da4b73207f5aae4:100000:ba7facc3edb89cd06ae810e29ced85980ff36de2bb596fcf513aaab626876440
 ----
 
-* Клијент подржава само „sha256” и „sha512”, компресије се искључује:
+// TRANSLATION MISSING
+* Клијент подржава само „sha256” и „sha512”, компресије се искључује,
+enable zstd (preferred) or zlib compression:
 
 ----
-(handshake) handshake password_hash_algo=sha256:sha512,compression=off
+(handshake) handshake password_hash_algo=sha256:sha512,compression=zstd:zlib
 ----
 
 Одговор:
@@ -238,7 +249,7 @@ htb: {
     'password_hash_iterations': '100000',
     'totp': 'on',
     'nonce': '85B1EE00695A5B254E14F4885538DF0D',
-    'compression': 'off',
+    'compression': 'zstd',
 }
 ----
 
@@ -264,9 +275,6 @@ _Ажурирано у верзијама 2.4, 2.8, 2.9._
 ** _password_: лозинка која се користи за аутентификацију са _релејем_ (опција _relay.network.password_ у програму WeeChat)
 ** _password_hash_: хеш лозинке која се користи за аутентификацију са _релејем_ (опција _relay.network.password_ у програму WeeChat), погледајте испод за формат _(WeeChat ≥ 2.8)_
 ** _totp_: Time-based One-Time Password (TOTP) која се користи као секундарни фактор аутентификације, уз лозинку (опција _relay.network.totp_secret_ у програму WeeChat) _(WeeChat ≥ 2.4)_
-** _compression_: тип компресије (*превазиђено* почевши од верзије 2.9, остало је из разлога компатибилности, али ви требало да се пошаље у <<command_handshake,handshake команди>>):
-*** _zlib_: укључује _zlib_ компресију порука које шаље _релеј_ (подразумевано је укључено ако _релеј_ подржава _zlib_ компресију)
-*** _off_: искључује компресију
 
 [NOTE]
 У програму WeeChat верзије ≥ 1.6, у вредности могу да се означе запете, на пример `+init password=foo\,bar+` када желите да пошаљете лозинку „foo,bar”.
@@ -1292,7 +1300,8 @@ quit
 * _дужина_ (неозначени цео број, 4 бајта): број бајтова у целој поруци (заједно са овим пољем)
 * _компресија_ (бајт): заставица:
 ** _0x00_: подаци који следе нису компресовани
-** _0x01_: подаци који следе су компресовани са _zlib_
+** _0x01_: подаци који следе су компресовани са https://zlib.net/[zlib]
+** _0x02_: подаци који следе су компресовани са https://facebook.github.io/zstd/[Zstandard]
 * _id_ (стринг, 4 бајта + садржај): идентификатор који послао клијент (пре имена команде); може бити и празан (стринг дужине нула и без садржаја) ако у команди није био наведен идентификатор
 * _тип_ (3 карактера): тип: 3 слова (погледајте табелу испод)
 * _објект_: објекат (погледајте табелу испод)
@@ -1300,7 +1309,10 @@ quit
 [[message_compression]]
 === Компресија
 
-Ако је вредност заставице _компресија_ 0x01, онда су *сви* подаци компресовани _zlib_ алгоритмом, тако да пре обраде морају да се декомпресују.
+// TRANSLATION MISSING
+If flag _compression_ is equal to 0x01 or 0x02, then *all* data after is compressed
+with https://zlib.net/[zlib] or https://facebook.github.io/zstd/[Zstandard],
+and therefore must be uncompressed before being processed.
 
 [[message_identifier]]
 === Идентификатор
diff --git a/doc/sr/weechat_user.sr.adoc b/doc/sr/weechat_user.sr.adoc
index 22587e0e6..6b25b5fb5 100644
--- a/doc/sr/weechat_user.sr.adoc
+++ b/doc/sr/weechat_user.sr.adoc
@@ -93,9 +93,12 @@ WeeChat почетна страница се налази на адреси: htt
 | pkg-config             |               | Детекција инсталираних библиотека.
 | libncursesw5-dev ^(2)^ |               | Ncurses интерфејс.
 | libcurl4-gnutls-dev    |               | URL пренос.
-| zlib1g-dev             |               | Компресија пакета у релеј додатку (weechat протокол), скрипт додатку.
 | libgcrypt20-dev        |               | Обезбеђени подаци, IRC SASL аутентификација.
 | libgnutls28-dev        | ≥ 2.2.0 ^(3)^ | SSL веза са IRC сервером, подршка за SSL у релеј додатку, IRC SASL аутентификација (ECDSA-NIST256P-CHALLENGE).
+// TRANSLATION MISSING
+| zlib1g-dev             |               | Compression of messages (WeeChat -> client) with https://zlib.net/[zlib] in relay plugin (weechat protocol), script plugin.
+// TRANSLATION MISSING
+| libzstd-dev            |               | Compression of messages (WeeChat -> client) with https://facebook.github.io/zstd/[Zstandard] in relay plugin (weechat protocol).
 |===
 
 [NOTE]
diff --git a/src/core/wee-debug.c b/src/core/wee-debug.c
index 3315348ab..425451c36 100644
--- a/src/core/wee-debug.c
+++ b/src/core/wee-debug.c
@@ -33,6 +33,7 @@
 #include <gcrypt.h>
 #include <curl/curl.h>
 #include <zlib.h>
+#include <zstd.h>
 
 #include <gnutls/gnutls.h>
 
@@ -580,6 +581,12 @@ debug_libs_cb (const void *pointer, void *data,
     gui_chat_printf (NULL, "    zlib: (?)");
 #endif /* ZLIB_VERSION */
 
+    /* display zstd version */
+    gui_chat_printf (NULL, "    zstd: %d.%d.%d",
+                    ZSTD_VERSION_MAJOR,
+                    ZSTD_VERSION_MINOR,
+                    ZSTD_VERSION_RELEASE);
+
     return WEECHAT_RC_OK;
 }
 
diff --git a/src/plugins/relay/CMakeLists.txt b/src/plugins/relay/CMakeLists.txt
index 451a54030..57e123074 100644
--- a/src/plugins/relay/CMakeLists.txt
+++ b/src/plugins/relay/CMakeLists.txt
@@ -43,13 +43,16 @@ set_target_properties(relay PROPERTIES PREFIX "")
 
 set(LINK_LIBS)
 
-list(APPEND LINK_LIBS ${ZLIB_LIBRARY})
-
 include_directories(${GNUTLS_INCLUDE_PATH})
 list(APPEND LINK_LIBS ${GNUTLS_LIBRARY})
 
 list(APPEND LINK_LIBS ${GCRYPT_LDFLAGS})
 
+list(APPEND LINK_LIBS ${ZLIB_LIBRARY})
+
+include_directories(${ZSTD_INCLUDE_DIRS})
+list(APPEND LINK_LIBS ${LIBZSTD_LDFLAGS})
+
 target_link_libraries(relay ${LINK_LIBS} coverage_config)
 
 install(TARGETS relay LIBRARY DESTINATION ${WEECHAT_LIBDIR}/plugins)
diff --git a/src/plugins/relay/Makefile.am b/src/plugins/relay/Makefile.am
index 1fcee124f..c84d09569 100644
--- a/src/plugins/relay/Makefile.am
+++ b/src/plugins/relay/Makefile.am
@@ -17,7 +17,7 @@
 # along with WeeChat.  If not, see <https://www.gnu.org/licenses/>.
 #
 
-AM_CPPFLAGS = -DLOCALEDIR=\"$(datadir)/locale\" $(ZLIB_CFLAGS) $(GCRYPT_CFLAGS) $(GNUTLS_CFLAGS)
+AM_CPPFLAGS = -DLOCALEDIR=\"$(datadir)/locale\" $(GCRYPT_CFLAGS) $(GNUTLS_CFLAGS) $(ZLIB_CFLAGS) $(ZSTD_CFLAGS)
 
 libdir = ${weechat_libdir}/plugins
 
@@ -61,6 +61,6 @@ relay_la_SOURCES = relay.c \
                    weechat/relay-weechat-protocol.h
 
 relay_la_LDFLAGS = -module -no-undefined
-relay_la_LIBADD  = $(RELAY_LFLAGS) $(ZLIB_LFLAGS) $(GCRYPT_LFLAGS) $(GNUTLS_LFLAGS)
+relay_la_LIBADD  = $(RELAY_LFLAGS) $(GCRYPT_LFLAGS) $(GNUTLS_LFLAGS) $(ZLIB_LFLAGS) $(ZSTD_LFLAGS)
 
 EXTRA_DIST = CMakeLists.txt
diff --git a/src/plugins/relay/relay-config.c b/src/plugins/relay/relay-config.c
index 790a38a53..3e85e182e 100644
--- a/src/plugins/relay/relay-config.c
+++ b/src/plugins/relay/relay-config.c
@@ -63,7 +63,7 @@ struct t_config_option *relay_config_network_allowed_ips;
 struct t_config_option *relay_config_network_auth_timeout;
 struct t_config_option *relay_config_network_bind_address;
 struct t_config_option *relay_config_network_clients_purge_delay;
-struct t_config_option *relay_config_network_compression_level;
+struct t_config_option *relay_config_network_compression;
 struct t_config_option *relay_config_network_ipv6;
 struct t_config_option *relay_config_network_max_clients;
 struct t_config_option *relay_config_network_nonce_size;
@@ -1070,13 +1070,16 @@ relay_config_init ()
            "clients immediately, -1 = never purge)"),
         NULL, -1, 60 * 24 * 30, "0", NULL, 0,
         NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL);
-    relay_config_network_compression_level = weechat_config_new_option (
+    relay_config_network_compression = weechat_config_new_option (
         relay_config_file, ptr_section,
-        "compression_level", "integer",
-        N_("compression level for packets sent to client with WeeChat protocol "
-           "(0 = disable compression, 1 = low compression ... 9 = best "
-           "compression)"),
-        NULL, 0, 9, "6", NULL, 0,
+        "compression", "integer",
+        N_("compression for packets sent to client with WeeChat "
+           "protocol: 0 = disable compression, 1 = low compression, fast "
+           "... 100 = best compression, slow; the value is a percentage "
+           "converted to 1-9 for zlib and 1-19 for zstd; "
+           "default value is 20 which is a sane default and offers good "
+           "compression and speed"),
+        NULL, 0, 100, "20", NULL, 0,
         NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL);
     relay_config_network_ipv6 = weechat_config_new_option (
         relay_config_file, ptr_section,
diff --git a/src/plugins/relay/relay-config.h b/src/plugins/relay/relay-config.h
index d5b9c9372..41d970bf3 100644
--- a/src/plugins/relay/relay-config.h
+++ b/src/plugins/relay/relay-config.h
@@ -42,7 +42,7 @@ extern struct t_config_option *relay_config_network_allowed_ips;
 extern struct t_config_option *relay_config_network_auth_timeout;
 extern struct t_config_option *relay_config_network_bind_address;
 extern struct t_config_option *relay_config_network_clients_purge_delay;
-extern struct t_config_option *relay_config_network_compression_level;
+extern struct t_config_option *relay_config_network_compression;
 extern struct t_config_option *relay_config_network_ipv6;
 extern struct t_config_option *relay_config_network_max_clients;
 extern struct t_config_option *relay_config_network_nonce_size;
diff --git a/src/plugins/relay/weechat/relay-weechat-msg.c b/src/plugins/relay/weechat/relay-weechat-msg.c
index 7703604d1..b11c68b88 100644
--- a/src/plugins/relay/weechat/relay-weechat-msg.c
+++ b/src/plugins/relay/weechat/relay-weechat-msg.c
@@ -29,6 +29,7 @@
 #include <errno.h>
 #include <arpa/inet.h>
 #include <zlib.h>
+#include <zstd.h>
 
 #include "../../weechat-plugin.h"
 #include "../relay.h"
@@ -1027,62 +1028,171 @@ relay_weechat_msg_add_nicklist (struct t_relay_weechat_msg *msg,
 }
 
 /*
- * Sends a message.
+ * Compresses the message with zlib.
+ *
+ * Returns:
+ *   1: OK, message compressed and sent
+ *   0: error, no message sent
  */
 
-void
-relay_weechat_msg_send (struct t_relay_client *client,
-                        struct t_relay_weechat_msg *msg)
+int
+relay_weechat_msg_compress_zlib (struct t_relay_client *client,
+                                 struct t_relay_weechat_msg *msg)
 {
+    char raw_message[1024];
     uint32_t size32;
-    char compression, raw_message[1024];
-    int rc;
     Bytef *dest;
     uLongf dest_size;
     struct timeval tv1, tv2;
     long long time_diff;
+    int rc, rc_compress, compression, compression_level;
+
+    rc = 0;
+    dest = NULL;
+
+    dest_size = compressBound (msg->data_size - 5);
+    dest = malloc (dest_size + 5);
+    if (!dest)
+        goto error;
+
+    /* convert % to zlib compression level (1-9) */
+    compression = weechat_config_integer (relay_config_network_compression);
+    compression_level = (((compression - 1) * 9) / 100) + 1;
+
+    gettimeofday (&tv1, NULL);
+    rc_compress = compress2 (
+        dest + 5,
+        &dest_size,
+        (Bytef *)(msg->data + 5),
+        msg->data_size - 5,
+        compression_level);
+    gettimeofday (&tv2, NULL);
+    time_diff = weechat_util_timeval_diff (&tv1, &tv2);
+    if ((rc_compress != Z_OK) || ((int)dest_size + 5 >= msg->data_size))
+        goto error;
+
+    /* set size and compression flag */
+    size32 = htonl ((uint32_t)(dest_size + 5));
+    memcpy (dest, &size32, 4);
+    dest[4] = RELAY_WEECHAT_COMPRESSION_ZLIB;
+
+    /* display message in raw buffer */
+    snprintf (raw_message, sizeof (raw_message),
+              "obj: %d/%d bytes (zlib: %d%%, %.2fms), id: %s",
+              (int)dest_size + 5,
+              msg->data_size,
+              100 - ((((int)dest_size + 5) * 100) / msg->data_size),
+              ((float)time_diff) / 1000,
+              msg->id);
+
+    /* send compressed data */
+    relay_client_send (client, RELAY_CLIENT_MSG_STANDARD,
+                       (const char *)dest, dest_size + 5,
+                       raw_message);
+
+    rc = 1;
+
+error:
+    if (dest)
+        free (dest);
+
+    return rc;
+}
+
+/*
+ * Compresses the message with zstd.
+ *
+ * Returns:
+ *   1: OK, message compressed and sent
+ *   0: error, no message sent
+ */
+
+int
+relay_weechat_msg_compress_zstd (struct t_relay_client *client,
+                                 struct t_relay_weechat_msg *msg)
+{
+    char raw_message[1024];
+    uint32_t size32;
+    Bytef *dest;
+    size_t dest_size, comp_size;
+    struct timeval tv1, tv2;
+    long long time_diff;
+    int rc, compression, compression_level;
+
+    rc = 0;
+    dest = NULL;
+
+    dest_size = ZSTD_compressBound (msg->data_size - 5);
+    dest = malloc (dest_size + 5);
+    if (!dest)
+        goto error;
+
+    /* convert % to zstd compression level (1-19) */
+    compression = weechat_config_integer (relay_config_network_compression);
+    compression_level = (((compression - 1) * 19) / 100) + 1;
+
+    gettimeofday (&tv1, NULL);
+    comp_size = ZSTD_compress(
+        dest + 5,
+        dest_size,
+        (void *)(msg->data + 5),
+        msg->data_size - 5,
+        compression_level);
+    gettimeofday (&tv2, NULL);
+    time_diff = weechat_util_timeval_diff (&tv1, &tv2);
+    if ((comp_size == 0) || ((int)comp_size + 5 >= msg->data_size))
+        goto error;
+
+    /* set size and compression flag */
+    size32 = htonl ((uint32_t)(comp_size + 5));
+    memcpy (dest, &size32, 4);
+    dest[4] = RELAY_WEECHAT_COMPRESSION_ZSTD;
+
+    /* display message in raw buffer */
+    snprintf (raw_message, sizeof (raw_message),
+              "obj: %d/%d bytes (zstd: %d%%, %.2fms), id: %s",
+              (int)comp_size + 5,
+              msg->data_size,
+              100 - ((((int)comp_size + 5) * 100) / msg->data_size),
+              ((float)time_diff) / 1000,
+              msg->id);
+
+    /* send compressed data */
+    relay_client_send (client, RELAY_CLIENT_MSG_STANDARD,
+                       (const char *)dest, comp_size + 5,
+                       raw_message);
+
+    rc = 1;
+
+error:
+    if (dest)
+        free (dest);
 
-    if (weechat_config_integer (relay_config_network_compression_level) > 0)
+    return rc;
+}
+
+/*
+ * Sends a message.
+ */
+
+void
+relay_weechat_msg_send (struct t_relay_client *client,
+                        struct t_relay_weechat_msg *msg)
+{
+    char compression, raw_message[1024];
+    uint32_t size32;
+
+    if (weechat_config_integer (relay_config_network_compression) > 0)
     {
         switch (RELAY_WEECHAT_DATA(client, compression))
         {
             case RELAY_WEECHAT_COMPRESSION_ZLIB:
-                dest_size = compressBound (msg->data_size - 5);
-                dest = malloc (dest_size + 5);
-                if (dest)
-                {
-                    gettimeofday (&tv1, NULL);
-                    rc = compress2 (dest + 5, &dest_size,
-                                    (Bytef *)(msg->data + 5), msg->data_size - 5,
-                                    weechat_config_integer (relay_config_network_compression_level));
-                    gettimeofday (&tv2, NULL);
-                    time_diff = weechat_util_timeval_diff (&tv1, &tv2);
-                    if ((rc == Z_OK) && ((int)dest_size + 5 < msg->data_size))
-                    {
-                        /* set size and compression flag */
-                        size32 = htonl ((uint32_t)(dest_size + 5));
-                        memcpy (dest, &size32, 4);
-                        dest[4] = RELAY_WEECHAT_COMPRESSION_ZLIB;
-
-                        /* display message in raw buffer */
-                        snprintf (raw_message, sizeof (raw_message),
-                                  "obj: %d/%d bytes (%d%%, %.2fms), id: %s",
-                                  (int)dest_size + 5,
-                                  msg->data_size,
-                                  100 - ((((int)dest_size + 5) * 100) / msg->data_size),
-                                  ((float)time_diff) / 1000,
-                                  msg->id);
-
-                        /* send compressed data */
-                        relay_client_send (client, RELAY_CLIENT_MSG_STANDARD,
-                                           (const char *)dest, dest_size + 5,
-                                           raw_message);
-
-                        free (dest);
-                        return;
-                    }
-                    free (dest);
-                }
+                if (relay_weechat_msg_compress_zlib (client, msg))
+                    return;
+                break;
+            case RELAY_WEECHAT_COMPRESSION_ZSTD:
+                if (relay_weechat_msg_compress_zstd (client, msg))
+                    return;
                 break;
             default:
                 break;
diff --git a/src/plugins/relay/weechat/relay-weechat-protocol.c b/src/plugins/relay/weechat/relay-weechat-protocol.c
index d8f1bf212..49188decb 100644
--- a/src/plugins/relay/weechat/relay-weechat-protocol.c
+++ b/src/plugins/relay/weechat/relay-weechat-protocol.c
@@ -229,7 +229,7 @@ relay_weechat_protocol_handshake_reply (struct t_relay_client *client,
 
 RELAY_WEECHAT_PROTOCOL_CALLBACK(handshake)
 {
-    char **options, **auths, *pos;
+    char **options, **auths, **compressions, *pos;
     int i, j, index_hash_algo, hash_algo_found, auth_allowed, compression;
     int password_received, plain_text_password;
 
@@ -292,9 +292,28 @@ RELAY_WEECHAT_PROTOCOL_CALLBACK(handshake)
                 }
                 else if (strcmp (options[i], "compression") == 0)
                 {
-                    compression = relay_weechat_compression_search (pos);
-                    if (compression >= 0)
-                        RELAY_WEECHAT_DATA(client, compression) = compression;
+                    compressions = weechat_string_split (
+                        pos,
+                        ":",
+                        NULL,
+                        WEECHAT_STRING_SPLIT_STRIP_LEFT
+                        | WEECHAT_STRING_SPLIT_STRIP_RIGHT
+                        | WEECHAT_STRING_SPLIT_COLLAPSE_SEPS,
+                        0,
+                        NULL);
+                    if (compressions)
+                    {
+                        for (j = 0; compressions[j]; j++)
+                        {
+                            compression = relay_weechat_compression_search (compressions[j]);
+                            if (compression >= 0)
+                            {
+                                RELAY_WEECHAT_DATA(client, compression) = compression;
+                                break;
+                            }
+                        }
+                        weechat_string_free_split (compressions);
+                    }
                 }
             }
         }
@@ -337,12 +356,9 @@ RELAY_WEECHAT_PROTOCOL_CALLBACK(handshake)
  *                  hash is given in hexadecimal
  *   totp           time-based one time password used as secondary
  *                  authentication factor
- *   compression    zlib (default) or off
  *
  * Message looks like:
  *   init password=mypass
- *   init password=mypass,compression=zlib
- *   init password=mypass,compression=off
  *   init password_hash=sha256:71c480df93d6ae2f1efad1447c66c9…,totp=123456
  *   init password_hash=pbkdf2:sha256:414232…:100000:01757d53157c…,totp=123456
  */
@@ -350,7 +366,7 @@ RELAY_WEECHAT_PROTOCOL_CALLBACK(handshake)
 RELAY_WEECHAT_PROTOCOL_CALLBACK(init)
 {
     char **options, *pos, *relay_password, *totp_secret, *info_totp_args, *info_totp;
-    int i, compression, length, password_received, totp_received;
+    int i, length, password_received, totp_received;
 
     RELAY_WEECHAT_PROTOCOL_MIN_ARGS(0);
 
@@ -411,12 +427,6 @@ RELAY_WEECHAT_PROTOCOL_CALLBACK(init)
                         }
                     }
                 }
-                else if (strcmp (options[i], "compression") == 0)
-                {
-                    compression = relay_weechat_compression_search (pos);
-                    if (compression >= 0)
-                        RELAY_WEECHAT_DATA(client, compression) = compression;
-                }
             }
         }
         weechat_string_free_split_command (options);
diff --git a/src/plugins/relay/weechat/relay-weechat.c b/src/plugins/relay/weechat/relay-weechat.c
index c12bf1cf2..8bdbb28ed 100644
--- a/src/plugins/relay/weechat/relay-weechat.c
+++ b/src/plugins/relay/weechat/relay-weechat.c
@@ -41,7 +41,7 @@
 
 
 char *relay_weechat_compression_string[] = /* strings for compression       */
-{ "off", "zlib" };
+{ "off", "zlib", "zstd" };
 
 
 /*
@@ -173,7 +173,7 @@ relay_weechat_alloc (struct t_relay_client *client)
     RELAY_WEECHAT_DATA(client, handshake_done) = 0;
     RELAY_WEECHAT_DATA(client, password_ok) = 0;
     RELAY_WEECHAT_DATA(client, totp_ok) = 0;
-    RELAY_WEECHAT_DATA(client, compression) = RELAY_WEECHAT_COMPRESSION_ZLIB;
+    RELAY_WEECHAT_DATA(client, compression) = RELAY_WEECHAT_COMPRESSION_OFF;
     RELAY_WEECHAT_DATA(client, buffers_sync) =
         weechat_hashtable_new (32,
                                WEECHAT_HASHTABLE_STRING,
diff --git a/src/plugins/relay/weechat/relay-weechat.h b/src/plugins/relay/weechat/relay-weechat.h
index c8339398b..1229ce8da 100644
--- a/src/plugins/relay/weechat/relay-weechat.h
+++ b/src/plugins/relay/weechat/relay-weechat.h
@@ -34,6 +34,7 @@ enum t_relay_weechat_compression
 {
     RELAY_WEECHAT_COMPRESSION_OFF = 0, /* no compression of binary objects  */
     RELAY_WEECHAT_COMPRESSION_ZLIB,    /* zlib compression                  */
+    RELAY_WEECHAT_COMPRESSION_ZSTD,    /* Zstandard compression             */
     /* number of compressions */
     RELAY_WEECHAT_NUM_COMPRESSIONS,
 };
diff --git a/tools/debian/patches/README b/tools/debian/patches/README
index a251bab14..3a2699a55 100644
--- a/tools/debian/patches/README
+++ b/tools/debian/patches/README
@@ -2,14 +2,3 @@ This directory contains patches that must be applied for some old Debian/Ubuntu
 versions, in order to build Debian packages.
 
 They are automatically applied by the script "tools/build-debian.sh".
-
-Notes for some versions of distributions:
-
-* asciidoctor:
-
-    On these distributions, asciidoctor must be installed manually with the command
-    "gem install asciidoctor" (as root):
-
-      - Debian jessie (8.0)
-      - Debian wheezy (7.0)
-      - Ubuntu trusty (14.04)
diff --git a/tools/debian/patches/weechat_debian_jessie.patch b/tools/debian/patches/weechat_debian_jessie.patch
deleted file mode 100644
index 4f695f2f6..000000000
--- a/tools/debian/patches/weechat_debian_jessie.patch
+++ /dev/null
@@ -1,217 +0,0 @@
-diff --git a/debian-devel/compat b/debian-devel/compat
-index 48082f72f..ec635144f 100644
---- a/debian-devel/compat
-+++ b/debian-devel/compat
-@@ -1 +1 @@
--12
-+9
-diff --git a/debian-devel/control b/debian-devel/control
-index bf94a36f1..7e7c82a21 100644
---- a/debian-devel/control
-+++ b/debian-devel/control
-@@ -3,19 +3,16 @@ Section: net
- Priority: optional
- Maintainer: Sébastien Helleu <flashcode@flashtux.org>
- Build-Depends:
--    asciidoctor (>= 1.5.4),
--    debhelper (>= 12),
-+    debhelper (>= 9),
-     cmake, pkg-config,
-     libncursesw5-dev,
-     gem2deb,
-     libperl-dev,
-     python3-dev,
-     libaspell-dev,
--    liblua5.3-dev,
-+    liblua5.1-0-dev,
-     tcl8.6-dev,
--    guile-2.2-dev,
--    php-dev, libphp-embed, libargon2-0-dev, libsodium-dev,
--    libxml2-dev,
-+    guile-2.0-dev,
-     libcurl4-gnutls-dev,
-     libgcrypt20-dev,
-     libgnutls28-dev,
-@@ -46,7 +43,7 @@ Description: Fast, light and extensible chat client (metapackage)
-   - 256 colors support
-   - incremental text search
-   - dynamic filtering of buffer content
--  - Perl, Python, Ruby, Lua, Tcl, Scheme and PHP scripting
-+  - Perl, Python, Ruby, Lua, Tcl and Scheme scripting
-   - script manager
-   - spell checking
-   - highly customizable and extensible
-@@ -76,7 +73,7 @@ Description: Fast, light and extensible chat client - console client
-   - 256 colors support
-   - incremental text search
-   - dynamic filtering of buffer content
--  - Perl, Python, Ruby, Lua, Tcl, Scheme and PHP scripting
-+  - Perl, Python, Ruby, Lua, Tcl and Scheme scripting
-   - script manager
-   - spell checking
-   - highly customizable and extensible
-@@ -107,7 +104,7 @@ Description: Fast, light and extensible chat client - headless client
-   - 256 colors support
-   - incremental text search
-   - dynamic filtering of buffer content
--  - Perl, Python, Ruby, Lua, Tcl, Scheme and PHP scripting
-+  - Perl, Python, Ruby, Lua, Tcl and Scheme scripting
-   - script manager
-   - spell checking
-   - highly customizable and extensible
-@@ -232,20 +229,6 @@ Description: Fast, light and extensible chat client - Guile plugin
-  .
-  This package provides the Guile scripting API plugin.
- 
--Package: weechat-devel-php
--Architecture: any
--Depends:
--    ${misc:Depends},
--    ${shlibs:Depends},
--    weechat-devel-curses (= ${binary:Version}) | weechat-devel-headless (= ${binary:Version}),
--    libphp-embed
--Conflicts: weechat-php
--Description: Fast, light and extensible chat client - PHP plugin
-- WeeChat (Wee Enhanced Environment for Chat) is a fast and light chat client
-- for many operating systems. Everything can be done with a keyboard.
-- .
-- This package provides the PHP scripting API plugin.
--
- Package: weechat-devel-doc
- Section: doc
- Architecture: all
-diff --git a/debian-devel/rules b/debian-devel/rules
-index 16a5f9516..e42c2a6b2 100755
---- a/debian-devel/rules
-+++ b/debian-devel/rules
-@@ -12,6 +12,7 @@ $(BUILDDIR)/Makefile:
- 		-DLIBDIR=/usr/lib/${DEB_HOST_MULTIARCH} \
- 		-DENABLE_DOC:BOOL=ON \
- 		-DENABLE_MAN:BOOL=ON \
-+		-DENABLE_PHP:BOOL=OFF \
- 		-DCMAKE_BUILD_TYPE:STRING=RelWithDebInfo \
- 		-DCMAKE_C_FLAGS_RELWITHDEBINFO:STRING="$(CFLAGS) -D_FORTIFY_SOURCE=2" \
- 		-DCMAKE_MODULE_LINKER_FLAGS_RELWITHDEBINFO:STRING="$(LDFLAGS)" \
-diff --git a/debian-devel/weechat-devel-php.dirs b/debian-devel/weechat-devel-php.dirs
-deleted file mode 120000
-index e4853a588..000000000
---- a/debian-devel/weechat-devel-php.dirs
-+++ /dev/null
-@@ -1 +0,0 @@
--../debian-stable/weechat-php.dirs
-\ No newline at end of file
-diff --git a/debian-devel/weechat-devel-php.install b/debian-devel/weechat-devel-php.install
-deleted file mode 120000
-index e358b515a..000000000
---- a/debian-devel/weechat-devel-php.install
-+++ /dev/null
-@@ -1 +0,0 @@
--../debian-stable/weechat-php.install
-\ No newline at end of file
-diff --git a/debian-stable/compat b/debian-stable/compat
-index 48082f72f..ec635144f 100644
---- a/debian-stable/compat
-+++ b/debian-stable/compat
-@@ -1 +1 @@
--12
-+9
-diff --git a/debian-stable/control b/debian-stable/control
-index ccf81cac8..d753f6856 100644
---- a/debian-stable/control
-+++ b/debian-stable/control
-@@ -3,19 +3,16 @@ Section: net
- Priority: optional
- Maintainer: Emmanuel Bouthenot <kolter@debian.org>
- Build-Depends:
--    asciidoctor (>= 1.5.4),
--    debhelper (>= 12),
-+    debhelper (>= 9),
-     cmake, pkg-config,
-     libncursesw5-dev,
-     gem2deb,
-     libperl-dev,
-     python3-dev,
-     libaspell-dev,
--    liblua5.3-dev,
-+    liblua5.1-0-dev,
-     tcl8.6-dev,
--    guile-2.2-dev,
--    php-dev, libphp-embed, libargon2-0-dev, libsodium-dev,
--    libxml2-dev,
-+    guile-2.0-dev,
-     libcurl4-gnutls-dev,
-     libgcrypt20-dev,
-     libgnutls28-dev,
-@@ -45,7 +42,7 @@ Description: Fast, light and extensible chat client (metapackage)
-   - 256 colors support
-   - incremental text search
-   - dynamic filtering of buffer content
--  - Perl, Python, Ruby, Lua, Tcl, Scheme and PHP scripting
-+  - Perl, Python, Ruby, Lua, Tcl and Scheme scripting
-   - script manager
-   - spell checking
-   - highly customizable and extensible
-@@ -74,7 +71,7 @@ Description: Fast, light and extensible chat client - console client
-   - 256 colors support
-   - incremental text search
-   - dynamic filtering of buffer content
--  - Perl, Python, Ruby, Lua, Tcl, Scheme and PHP scripting
-+  - Perl, Python, Ruby, Lua, Tcl and Scheme scripting
-   - script manager
-   - spell checking
-   - highly customizable and extensible
-@@ -104,7 +101,7 @@ Description: Fast, light and extensible chat client - headless client
-   - 256 colors support
-   - incremental text search
-   - dynamic filtering of buffer content
--  - Perl, Python, Ruby, Lua, Tcl, Scheme and PHP scripting
-+  - Perl, Python, Ruby, Lua, Tcl and Scheme scripting
-   - script manager
-   - spell checking
-   - highly customizable and extensible
-@@ -221,19 +218,6 @@ Description: Fast, light and extensible chat client - Guile plugin
-  .
-  This package provides the Guile scripting API plugin.
- 
--Package: weechat-php
--Architecture: any
--Depends:
--    ${misc:Depends},
--    ${shlibs:Depends},
--    weechat-curses (= ${binary:Version}) | weechat-headless (= ${binary:Version}),
--    libphp-embed
--Description: Fast, light and extensible chat client - PHP plugin
-- WeeChat (Wee Enhanced Environment for Chat) is a fast and light chat client
-- for many operating systems. Everything can be done with a keyboard.
-- .
-- This package provides the PHP scripting API plugin.
--
- Package: weechat-doc
- Section: doc
- Architecture: all
-diff --git a/debian-stable/rules b/debian-stable/rules
-index 16a5f9516..e42c2a6b2 100755
---- a/debian-stable/rules
-+++ b/debian-stable/rules
-@@ -12,6 +12,7 @@ $(BUILDDIR)/Makefile:
- 		-DLIBDIR=/usr/lib/${DEB_HOST_MULTIARCH} \
- 		-DENABLE_DOC:BOOL=ON \
- 		-DENABLE_MAN:BOOL=ON \
-+		-DENABLE_PHP:BOOL=OFF \
- 		-DCMAKE_BUILD_TYPE:STRING=RelWithDebInfo \
- 		-DCMAKE_C_FLAGS_RELWITHDEBINFO:STRING="$(CFLAGS) -D_FORTIFY_SOURCE=2" \
- 		-DCMAKE_MODULE_LINKER_FLAGS_RELWITHDEBINFO:STRING="$(LDFLAGS)" \
-diff --git a/debian-stable/weechat-php.dirs b/debian-stable/weechat-php.dirs
-deleted file mode 100644
-index 68457717b..000000000
---- a/debian-stable/weechat-php.dirs
-+++ /dev/null
-@@ -1 +0,0 @@
--usr/lib
-diff --git a/debian-stable/weechat-php.install b/debian-stable/weechat-php.install
-deleted file mode 100644
-index 0a1b73563..000000000
---- a/debian-stable/weechat-php.install
-+++ /dev/null
-@@ -1 +0,0 @@
--usr/lib/*/weechat/plugins/php.so
diff --git a/tools/debian/patches/weechat_debian_wheezy.patch b/tools/debian/patches/weechat_debian_wheezy.patch
deleted file mode 100644
index 3ada32109..000000000
--- a/tools/debian/patches/weechat_debian_wheezy.patch
+++ /dev/null
@@ -1,227 +0,0 @@
-diff --git a/debian-devel/compat b/debian-devel/compat
-index 48082f72f..ec635144f 100644
---- a/debian-devel/compat
-+++ b/debian-devel/compat
-@@ -1 +1 @@
--12
-+9
-diff --git a/debian-devel/control b/debian-devel/control
-index bf94a36f1..8d4d60e9f 100644
---- a/debian-devel/control
-+++ b/debian-devel/control
-@@ -3,8 +3,7 @@ Section: net
- Priority: optional
- Maintainer: Sébastien Helleu <flashcode@flashtux.org>
- Build-Depends:
--    asciidoctor (>= 1.5.4),
--    debhelper (>= 12),
-+    debhelper (>= 9),
-     cmake, pkg-config,
-     libncursesw5-dev,
-     gem2deb,
-@@ -12,13 +11,11 @@ Build-Depends:
-     python3-dev,
-     libaspell-dev,
-     liblua5.3-dev,
--    tcl8.6-dev,
--    guile-2.2-dev,
--    php-dev, libphp-embed, libargon2-0-dev, libsodium-dev,
--    libxml2-dev,
-+    tcl8.5-dev,
-+    guile-2.0-dev,
-     libcurl4-gnutls-dev,
--    libgcrypt20-dev,
--    libgnutls28-dev,
-+    libgcrypt11-dev,
-+    libgnutls-dev,
-     zlib1g-dev
- Standards-Version: 4.6.0.1
- Homepage: https://weechat.org/
-@@ -46,7 +43,7 @@ Description: Fast, light and extensible chat client (metapackage)
-   - 256 colors support
-   - incremental text search
-   - dynamic filtering of buffer content
--  - Perl, Python, Ruby, Lua, Tcl, Scheme and PHP scripting
-+  - Perl, Python, Ruby, Lua, Tcl and Scheme scripting
-   - script manager
-   - spell checking
-   - highly customizable and extensible
-@@ -76,7 +73,7 @@ Description: Fast, light and extensible chat client - console client
-   - 256 colors support
-   - incremental text search
-   - dynamic filtering of buffer content
--  - Perl, Python, Ruby, Lua, Tcl, Scheme and PHP scripting
-+  - Perl, Python, Ruby, Lua, Tcl and Scheme scripting
-   - script manager
-   - spell checking
-   - highly customizable and extensible
-@@ -107,7 +104,7 @@ Description: Fast, light and extensible chat client - headless client
-   - 256 colors support
-   - incremental text search
-   - dynamic filtering of buffer content
--  - Perl, Python, Ruby, Lua, Tcl, Scheme and PHP scripting
-+  - Perl, Python, Ruby, Lua, Tcl and Scheme scripting
-   - script manager
-   - spell checking
-   - highly customizable and extensible
-@@ -232,20 +229,6 @@ Description: Fast, light and extensible chat client - Guile plugin
-  .
-  This package provides the Guile scripting API plugin.
- 
--Package: weechat-devel-php
--Architecture: any
--Depends:
--    ${misc:Depends},
--    ${shlibs:Depends},
--    weechat-devel-curses (= ${binary:Version}) | weechat-devel-headless (= ${binary:Version}),
--    libphp-embed
--Conflicts: weechat-php
--Description: Fast, light and extensible chat client - PHP plugin
-- WeeChat (Wee Enhanced Environment for Chat) is a fast and light chat client
-- for many operating systems. Everything can be done with a keyboard.
-- .
-- This package provides the PHP scripting API plugin.
--
- Package: weechat-devel-doc
- Section: doc
- Architecture: all
-diff --git a/debian-devel/rules b/debian-devel/rules
-index 16a5f9516..3edb65fa5 100755
---- a/debian-devel/rules
-+++ b/debian-devel/rules
-@@ -1,7 +1,5 @@
- #!/usr/bin/make -f
- 
--export DEB_BUILD_MAINT_OPTIONS=hardening=+all
--
- BUILDDIR = builddir
- 
- $(BUILDDIR)/Makefile:
-diff --git a/debian-devel/weechat-devel-php.dirs b/debian-devel/weechat-devel-php.dirs
-deleted file mode 120000
-index e4853a588..000000000
---- a/debian-devel/weechat-devel-php.dirs
-+++ /dev/null
-@@ -1 +0,0 @@
--../debian-stable/weechat-php.dirs
-\ No newline at end of file
-diff --git a/debian-devel/weechat-devel-php.install b/debian-devel/weechat-devel-php.install
-deleted file mode 120000
-index e358b515a..000000000
---- a/debian-devel/weechat-devel-php.install
-+++ /dev/null
-@@ -1 +0,0 @@
--../debian-stable/weechat-php.install
-\ No newline at end of file
-diff --git a/debian-stable/compat b/debian-stable/compat
-index 48082f72f..ec635144f 100644
---- a/debian-stable/compat
-+++ b/debian-stable/compat
-@@ -1 +1 @@
--12
-+9
-diff --git a/debian-stable/control b/debian-stable/control
-index ccf81cac8..ee2e092eb 100644
---- a/debian-stable/control
-+++ b/debian-stable/control
-@@ -3,8 +3,7 @@ Section: net
- Priority: optional
- Maintainer: Emmanuel Bouthenot <kolter@debian.org>
- Build-Depends:
--    asciidoctor (>= 1.5.4),
--    debhelper (>= 12),
-+    debhelper (>= 9),
-     cmake, pkg-config,
-     libncursesw5-dev,
-     gem2deb,
-@@ -12,13 +11,11 @@ Build-Depends:
-     python3-dev,
-     libaspell-dev,
-     liblua5.3-dev,
--    tcl8.6-dev,
--    guile-2.2-dev,
--    php-dev, libphp-embed, libargon2-0-dev, libsodium-dev,
--    libxml2-dev,
-+    tcl8.5-dev,
-+    guile-2.0-dev,
-     libcurl4-gnutls-dev,
--    libgcrypt20-dev,
--    libgnutls28-dev,
-+    libgcrypt11-dev,
-+    libgnutls-dev,
-     zlib1g-dev
- Standards-Version: 4.6.0.1
- Homepage: https://weechat.org/
-@@ -45,7 +42,7 @@ Description: Fast, light and extensible chat client (metapackage)
-   - 256 colors support
-   - incremental text search
-   - dynamic filtering of buffer content
--  - Perl, Python, Ruby, Lua, Tcl, Scheme and PHP scripting
-+  - Perl, Python, Ruby, Lua, Tcl and Scheme scripting
-   - script manager
-   - spell checking
-   - highly customizable and extensible
-@@ -74,7 +71,7 @@ Description: Fast, light and extensible chat client - console client
-   - 256 colors support
-   - incremental text search
-   - dynamic filtering of buffer content
--  - Perl, Python, Ruby, Lua, Tcl, Scheme and PHP scripting
-+  - Perl, Python, Ruby, Lua, Tcl and Scheme scripting
-   - script manager
-   - spell checking
-   - highly customizable and extensible
-@@ -104,7 +101,7 @@ Description: Fast, light and extensible chat client - headless client
-   - 256 colors support
-   - incremental text search
-   - dynamic filtering of buffer content
--  - Perl, Python, Ruby, Lua, Tcl, Scheme and PHP scripting
-+  - Perl, Python, Ruby, Lua, Tcl and Scheme scripting
-   - script manager
-   - spell checking
-   - highly customizable and extensible
-@@ -221,19 +218,6 @@ Description: Fast, light and extensible chat client - Guile plugin
-  .
-  This package provides the Guile scripting API plugin.
- 
--Package: weechat-php
--Architecture: any
--Depends:
--    ${misc:Depends},
--    ${shlibs:Depends},
--    weechat-curses (= ${binary:Version}) | weechat-headless (= ${binary:Version}),
--    libphp-embed
--Description: Fast, light and extensible chat client - PHP plugin
-- WeeChat (Wee Enhanced Environment for Chat) is a fast and light chat client
-- for many operating systems. Everything can be done with a keyboard.
-- .
-- This package provides the PHP scripting API plugin.
--
- Package: weechat-doc
- Section: doc
- Architecture: all
-diff --git a/debian-stable/rules b/debian-stable/rules
-index 16a5f9516..3edb65fa5 100755
---- a/debian-stable/rules
-+++ b/debian-stable/rules
-@@ -1,7 +1,5 @@
- #!/usr/bin/make -f
- 
--export DEB_BUILD_MAINT_OPTIONS=hardening=+all
--
- BUILDDIR = builddir
- 
- $(BUILDDIR)/Makefile:
-diff --git a/debian-stable/weechat-php.dirs b/debian-stable/weechat-php.dirs
-deleted file mode 100644
-index 68457717b..000000000
---- a/debian-stable/weechat-php.dirs
-+++ /dev/null
-@@ -1 +0,0 @@
--usr/lib
-diff --git a/debian-stable/weechat-php.install b/debian-stable/weechat-php.install
-deleted file mode 100644
-index 0a1b73563..000000000
---- a/debian-stable/weechat-php.install
-+++ /dev/null
-@@ -1 +0,0 @@
--usr/lib/*/weechat/plugins/php.so
diff --git a/tools/debian/patches/weechat_ubuntu_artful.patch b/tools/debian/patches/weechat_ubuntu_artful.patch
deleted file mode 120000
index ab23b0230..000000000
--- a/tools/debian/patches/weechat_ubuntu_artful.patch
+++ /dev/null
@@ -1 +0,0 @@
-weechat_debian_stretch.patch
\ No newline at end of file
diff --git a/tools/debian/patches/weechat_ubuntu_bionic.patch b/tools/debian/patches/weechat_ubuntu_bionic.patch
index 6e83bab00..c1a9f6d57 120000..100644
--- a/tools/debian/patches/weechat_ubuntu_bionic.patch
+++ b/tools/debian/patches/weechat_ubuntu_bionic.patch
@@ -1 +1,40 @@
-weechat_ubuntu_disco.patch
\ No newline at end of file
+diff --git a/debian-devel/compat b/debian-devel/compat
+index 48082f72f..b4de39476 100644
+--- a/debian-devel/compat
++++ b/debian-devel/compat
+@@ -1 +1 @@
+-12
++11
+diff --git a/debian-devel/control b/debian-devel/control
+index a6cc3c91c..d078d35b7 100644
+--- a/debian-devel/control
++++ b/debian-devel/control
+@@ -4,7 +4,7 @@ Priority: optional
+ Maintainer: Sébastien Helleu <flashcode@flashtux.org>
+ Build-Depends:
+     asciidoctor (>= 1.5.4),
+-    debhelper (>= 12),
++    debhelper (>= 11),
+     cmake, pkg-config,
+     libncursesw5-dev,
+     gem2deb,
+diff --git a/debian-stable/compat b/debian-stable/compat
+index 48082f72f..b4de39476 100644
+--- a/debian-stable/compat
++++ b/debian-stable/compat
+@@ -1 +1 @@
+-12
++11
+diff --git a/debian-stable/control b/debian-stable/control
+index 1b0a27009..7880ce7bd 100644
+--- a/debian-stable/control
++++ b/debian-stable/control
+@@ -4,7 +4,7 @@ Priority: optional
+ Maintainer: Emmanuel Bouthenot <kolter@debian.org>
+ Build-Depends:
+     asciidoctor (>= 1.5.4),
+-    debhelper (>= 12),
++    debhelper (>= 11),
+     cmake, pkg-config,
+     libncursesw5-dev,
+     gem2deb,
diff --git a/tools/debian/patches/weechat_ubuntu_cosmic.patch b/tools/debian/patches/weechat_ubuntu_cosmic.patch
deleted file mode 120000
index 6e83bab00..000000000
--- a/tools/debian/patches/weechat_ubuntu_cosmic.patch
+++ /dev/null
@@ -1 +0,0 @@
-weechat_ubuntu_disco.patch
\ No newline at end of file
diff --git a/tools/debian/patches/weechat_ubuntu_disco.patch b/tools/debian/patches/weechat_ubuntu_disco.patch
deleted file mode 100644
index c1a9f6d57..000000000
--- a/tools/debian/patches/weechat_ubuntu_disco.patch
+++ /dev/null
@@ -1,40 +0,0 @@
-diff --git a/debian-devel/compat b/debian-devel/compat
-index 48082f72f..b4de39476 100644
---- a/debian-devel/compat
-+++ b/debian-devel/compat
-@@ -1 +1 @@
--12
-+11
-diff --git a/debian-devel/control b/debian-devel/control
-index a6cc3c91c..d078d35b7 100644
---- a/debian-devel/control
-+++ b/debian-devel/control
-@@ -4,7 +4,7 @@ Priority: optional
- Maintainer: Sébastien Helleu <flashcode@flashtux.org>
- Build-Depends:
-     asciidoctor (>= 1.5.4),
--    debhelper (>= 12),
-+    debhelper (>= 11),
-     cmake, pkg-config,
-     libncursesw5-dev,
-     gem2deb,
-diff --git a/debian-stable/compat b/debian-stable/compat
-index 48082f72f..b4de39476 100644
---- a/debian-stable/compat
-+++ b/debian-stable/compat
-@@ -1 +1 @@
--12
-+11
-diff --git a/debian-stable/control b/debian-stable/control
-index 1b0a27009..7880ce7bd 100644
---- a/debian-stable/control
-+++ b/debian-stable/control
-@@ -4,7 +4,7 @@ Priority: optional
- Maintainer: Emmanuel Bouthenot <kolter@debian.org>
- Build-Depends:
-     asciidoctor (>= 1.5.4),
--    debhelper (>= 12),
-+    debhelper (>= 11),
-     cmake, pkg-config,
-     libncursesw5-dev,
-     gem2deb,
diff --git a/tools/debian/patches/weechat_ubuntu_trusty.patch b/tools/debian/patches/weechat_ubuntu_trusty.patch
deleted file mode 100644
index 505146a9d..000000000
--- a/tools/debian/patches/weechat_ubuntu_trusty.patch
+++ /dev/null
@@ -1,199 +0,0 @@
-diff --git a/debian-devel/compat b/debian-devel/compat
-index 48082f72f..ec635144f 100644
---- a/debian-devel/compat
-+++ b/debian-devel/compat
-@@ -1 +1 @@
--12
-+9
-diff --git a/debian-devel/control b/debian-devel/control
-index bf94a36f1..566d71f09 100644
---- a/debian-devel/control
-+++ b/debian-devel/control
-@@ -3,8 +3,7 @@ Section: net
- Priority: optional
- Maintainer: Sébastien Helleu <flashcode@flashtux.org>
- Build-Depends:
--    asciidoctor (>= 1.5.4),
--    debhelper (>= 12),
-+    debhelper (>= 9),
-     cmake, pkg-config,
-     libncursesw5-dev,
-     gem2deb,
-@@ -13,12 +12,10 @@ Build-Depends:
-     libaspell-dev,
-     liblua5.3-dev,
-     tcl8.6-dev,
--    guile-2.2-dev,
--    php-dev, libphp-embed, libargon2-0-dev, libsodium-dev,
--    libxml2-dev,
-+    guile-2.0-dev,
-     libcurl4-gnutls-dev,
--    libgcrypt20-dev,
--    libgnutls28-dev,
-+    libgcrypt11-dev,
-+    libgnutls-dev,
-     zlib1g-dev
- Standards-Version: 4.6.0.1
- Homepage: https://weechat.org/
-@@ -46,7 +43,7 @@ Description: Fast, light and extensible chat client (metapackage)
-   - 256 colors support
-   - incremental text search
-   - dynamic filtering of buffer content
--  - Perl, Python, Ruby, Lua, Tcl, Scheme and PHP scripting
-+  - Perl, Python, Ruby, Lua, Tcl and Scheme scripting
-   - script manager
-   - spell checking
-   - highly customizable and extensible
-@@ -76,7 +73,7 @@ Description: Fast, light and extensible chat client - console client
-   - 256 colors support
-   - incremental text search
-   - dynamic filtering of buffer content
--  - Perl, Python, Ruby, Lua, Tcl, Scheme and PHP scripting
-+  - Perl, Python, Ruby, Lua, Tcl and Scheme scripting
-   - script manager
-   - spell checking
-   - highly customizable and extensible
-@@ -107,7 +104,7 @@ Description: Fast, light and extensible chat client - headless client
-   - 256 colors support
-   - incremental text search
-   - dynamic filtering of buffer content
--  - Perl, Python, Ruby, Lua, Tcl, Scheme and PHP scripting
-+  - Perl, Python, Ruby, Lua, Tcl and Scheme scripting
-   - script manager
-   - spell checking
-   - highly customizable and extensible
-@@ -232,20 +229,6 @@ Description: Fast, light and extensible chat client - Guile plugin
-  .
-  This package provides the Guile scripting API plugin.
- 
--Package: weechat-devel-php
--Architecture: any
--Depends:
--    ${misc:Depends},
--    ${shlibs:Depends},
--    weechat-devel-curses (= ${binary:Version}) | weechat-devel-headless (= ${binary:Version}),
--    libphp-embed
--Conflicts: weechat-php
--Description: Fast, light and extensible chat client - PHP plugin
-- WeeChat (Wee Enhanced Environment for Chat) is a fast and light chat client
-- for many operating systems. Everything can be done with a keyboard.
-- .
-- This package provides the PHP scripting API plugin.
--
- Package: weechat-devel-doc
- Section: doc
- Architecture: all
-diff --git a/debian-devel/weechat-devel-php.dirs b/debian-devel/weechat-devel-php.dirs
-deleted file mode 120000
-index e4853a588..000000000
---- a/debian-devel/weechat-devel-php.dirs
-+++ /dev/null
-@@ -1 +0,0 @@
--../debian-stable/weechat-php.dirs
-\ No newline at end of file
-diff --git a/debian-devel/weechat-devel-php.install b/debian-devel/weechat-devel-php.install
-deleted file mode 120000
-index e358b515a..000000000
---- a/debian-devel/weechat-devel-php.install
-+++ /dev/null
-@@ -1 +0,0 @@
--../debian-stable/weechat-php.install
-\ No newline at end of file
-diff --git a/debian-stable/compat b/debian-stable/compat
-index 48082f72f..ec635144f 100644
---- a/debian-stable/compat
-+++ b/debian-stable/compat
-@@ -1 +1 @@
--12
-+9
-diff --git a/debian-stable/control b/debian-stable/control
-index ccf81cac8..b11b9b64e 100644
---- a/debian-stable/control
-+++ b/debian-stable/control
-@@ -3,8 +3,7 @@ Section: net
- Priority: optional
- Maintainer: Emmanuel Bouthenot <kolter@debian.org>
- Build-Depends:
--    asciidoctor (>= 1.5.4),
--    debhelper (>= 12),
-+    debhelper (>= 9),
-     cmake, pkg-config,
-     libncursesw5-dev,
-     gem2deb,
-@@ -13,12 +12,10 @@ Build-Depends:
-     libaspell-dev,
-     liblua5.3-dev,
-     tcl8.6-dev,
--    guile-2.2-dev,
--    php-dev, libphp-embed, libargon2-0-dev, libsodium-dev,
--    libxml2-dev,
-+    guile-2.0-dev,
-     libcurl4-gnutls-dev,
--    libgcrypt20-dev,
--    libgnutls28-dev,
-+    libgcrypt11-dev,
-+    libgnutls-dev,
-     zlib1g-dev
- Standards-Version: 4.6.0.1
- Homepage: https://weechat.org/
-@@ -45,7 +42,7 @@ Description: Fast, light and extensible chat client (metapackage)
-   - 256 colors support
-   - incremental text search
-   - dynamic filtering of buffer content
--  - Perl, Python, Ruby, Lua, Tcl, Scheme and PHP scripting
-+  - Perl, Python, Ruby, Lua, Tcl and Scheme scripting
-   - script manager
-   - spell checking
-   - highly customizable and extensible
-@@ -74,7 +71,7 @@ Description: Fast, light and extensible chat client - console client
-   - 256 colors support
-   - incremental text search
-   - dynamic filtering of buffer content
--  - Perl, Python, Ruby, Lua, Tcl, Scheme and PHP scripting
-+  - Perl, Python, Ruby, Lua, Tcl and Scheme scripting
-   - script manager
-   - spell checking
-   - highly customizable and extensible
-@@ -104,7 +101,7 @@ Description: Fast, light and extensible chat client - headless client
-   - 256 colors support
-   - incremental text search
-   - dynamic filtering of buffer content
--  - Perl, Python, Ruby, Lua, Tcl, Scheme and PHP scripting
-+  - Perl, Python, Ruby, Lua, Tcl and Scheme scripting
-   - script manager
-   - spell checking
-   - highly customizable and extensible
-@@ -221,19 +218,6 @@ Description: Fast, light and extensible chat client - Guile plugin
-  .
-  This package provides the Guile scripting API plugin.
- 
--Package: weechat-php
--Architecture: any
--Depends:
--    ${misc:Depends},
--    ${shlibs:Depends},
--    weechat-curses (= ${binary:Version}) | weechat-headless (= ${binary:Version}),
--    libphp-embed
--Description: Fast, light and extensible chat client - PHP plugin
-- WeeChat (Wee Enhanced Environment for Chat) is a fast and light chat client
-- for many operating systems. Everything can be done with a keyboard.
-- .
-- This package provides the PHP scripting API plugin.
--
- Package: weechat-doc
- Section: doc
- Architecture: all
-diff --git a/debian-stable/weechat-php.dirs b/debian-stable/weechat-php.dirs
-deleted file mode 100644
-index 68457717b..000000000
---- a/debian-stable/weechat-php.dirs
-+++ /dev/null
-@@ -1 +0,0 @@
--usr/lib
-diff --git a/debian-stable/weechat-php.install b/debian-stable/weechat-php.install
-deleted file mode 100644
-index 0a1b73563..000000000
---- a/debian-stable/weechat-php.install
-+++ /dev/null
-@@ -1 +0,0 @@
--usr/lib/*/weechat/plugins/php.so
diff --git a/weechat.cygport.in b/weechat.cygport.in
index 27f5457b2..b39674321 100644
--- a/weechat.cygport.in
+++ b/weechat.cygport.in
@@ -53,7 +53,8 @@ SRC_URI="https://weechat.org/files/src/weechat-${VERSION}.tar.bz2"
 # Build dependencies only
 DEPEND="cmake gettext gettext-devel libgnutls-devel libaspell-devel \
 libcurl-devel libgcrypt-devel libncurses-devel lua perl pkg-config \
-python3-devel ruby tcl-devel libguile2.2-devel php-devel zlib-devel"
+python3-devel ruby tcl-devel libguile2.2-devel php-devel libzstd-devel \
+zlib-devel"
 
 #
 # CMake compilation of WeeChat: