--- Python-3.9.4/config.sub	2021-02-21 20:22:43.901024503 +0100
+++ Python-3.9.4/config.sub	2021-02-21 20:24:35.079400552 +0100
@@ -1485,6 +1485,8 @@
 	-oss*)
 		os=-sysv3
 		;;
+	-serenity*)
+		;;
 	-svr4*)
 		os=-sysv4
 		;;
--- Python-3.9.4/configure.ac	2021-04-06 20:59:45.319060429 +0200
+++ Python-3.9.4/configure.ac	2021-04-06 21:02:33.875267539 +0200
@@ -389,6 +389,9 @@
        # a lot of different things including 'define_xopen_source'
        # in the case statement below.
 	case "$host" in
+	*-*-serenity*)
+		ac_sys_system=Serenity
+		;;
 	*-*-linux-android*)
 		ac_sys_system=Linux-android
 		;;
@@ -435,6 +438,9 @@
 AC_SUBST(_PYTHON_HOST_PLATFORM)
 if test "$cross_compiling" = yes; then
 	case "$host" in
+	*-*-serenity*)
+		_host_cpu=$host_cpu
+		;;
 	*-*-linux*)
 		case "$host_cpu" in
 		arm*)
--- Python-3.9.4/configure	2021-02-21 20:22:43.898024520 +0100
+++ Python-3.9.4/configure	2021-02-21 20:24:35.096400457 +0100
@@ -3292,6 +3292,9 @@
        # a lot of different things including 'define_xopen_source'
        # in the case statement below.
 	case "$host" in
+	*-*-serenity*)
+		ac_sys_system=Serenity
+		;;
 	*-*-linux-android*)
 		ac_sys_system=Linux-android
 		;;
@@ -3339,6 +3342,9 @@
 
 if test "$cross_compiling" = yes; then
 	case "$host" in
+	*-*-serenity*)
+		_host_cpu=$host_cpu
+		;;
 	*-*-linux*)
 		case "$host_cpu" in
 		arm*)