--- imap/tls.c.orig	2018-04-30 02:05:44 UTC
+++ imap/tls.c
@@ -734,7 +734,9 @@ EXPORTED int     tls_init_serverengine(c
     off |= SSL_OP_ALL;            /* Work around all known bugs */
     off |= SSL_OP_NO_SSLv2;       /* Disable insecure SSLv2 */
     off |= SSL_OP_NO_SSLv3;       /* Disable insecure SSLv3 */
+#if defined(SSL_OP_NO_COMPRESSION)
     off |= SSL_OP_NO_COMPRESSION; /* Disable TLS compression */
+#endif
 
     const char *tls_versions = config_getstring(IMAPOPT_TLS_VERSIONS);
 
@@ -1465,7 +1467,9 @@ HIDDEN int tls_init_clientengine(int ver
     off |= SSL_OP_ALL;            /* Work around all known bugs */
     off |= SSL_OP_NO_SSLv2;       /* Disable insecure SSLv2 */
     off |= SSL_OP_NO_SSLv3;       /* Disable insecure SSLv3 */
+#if defined(SSL_OP_NO_COMPRESSION)
     off |= SSL_OP_NO_COMPRESSION; /* Disable TLS compression */
+#endif
 
     SSL_CTX_set_options(c_ctx, off);
     SSL_CTX_set_info_callback(c_ctx, apps_ssl_info_callback);