--- Python-3.9.5/config.sub	2021-02-21 20:22:43.901024503 +0100
+++ Python-3.9.5/config.sub	2021-02-21 20:24:35.079400552 +0100
@@ -1485,6 +1485,8 @@
 	-oss*)
 		os=-sysv3
 		;;
+	-serenity*)
+		;;
 	-svr4*)
 		os=-sysv4
 		;;
--- Python-3.9.5/configure.ac	2021-05-03 15:54:42.000000000 +0100
+++ Python-3.9.5/configure.ac	2021-05-06 16:40:34.503092204 +0100
@@ -391,6 +391,9 @@
        # a lot of different things including 'define_xopen_source'
        # in the case statement below.
 	case "$host" in
+	*-*-serenity*)
+		ac_sys_system=SerenityOS
+		;;
 	*-*-linux-android*)
 		ac_sys_system=Linux-android
 		;;
@@ -429,6 +432,7 @@
 	linux*) MACHDEP="linux";;
 	cygwin*) MACHDEP="cygwin";;
 	darwin*) MACHDEP="darwin";;
+	serenityos*) MACHDEP="serenityos";;
 	'')	MACHDEP="unknown";;
     esac
 fi
@@ -437,6 +441,9 @@
 AC_SUBST(_PYTHON_HOST_PLATFORM)
 if test "$cross_compiling" = yes; then
 	case "$host" in
+	*-*-serenity*)
+		_host_cpu=$host_cpu
+		;;
 	*-*-linux*)
 		case "$host_cpu" in
 		arm*)
--- Python-3.9.5/configure	2021-05-03 15:54:42.000000000 +0100
+++ Python-3.9.5/configure	2021-05-06 16:39:39.108339089 +0100
@@ -3295,6 +3295,9 @@
        # a lot of different things including 'define_xopen_source'
        # in the case statement below.
 	case "$host" in
+	*-*-serenity*)
+		ac_sys_system=SerenityOS
+		;;
 	*-*-linux-android*)
 		ac_sys_system=Linux-android
 		;;
@@ -3333,6 +3336,7 @@
 	linux*) MACHDEP="linux";;
 	cygwin*) MACHDEP="cygwin";;
 	darwin*) MACHDEP="darwin";;
+	serenityos*) MACHDEP="serenityos";;
 	'')	MACHDEP="unknown";;
     esac
 fi
@@ -3342,6 +3346,9 @@

 if test "$cross_compiling" = yes; then
 	case "$host" in
+	*-*-serenity*)
+		_host_cpu=$host_cpu
+		;;
 	*-*-linux*)
 		case "$host_cpu" in
 		arm*)
@@ -9646,6 +9653,7 @@
 #	    LINKFORSHARED="-Wl,-E -Wl,+s -Wl,+b\$(BINLIBDEST)/lib-dynload";;
 	Linux-android*) LINKFORSHARED="-pie -Xlinker -export-dynamic";;
 	Linux*|GNU*) LINKFORSHARED="-Xlinker -export-dynamic";;
+	SerenityOS*) LINKFORSHARED="-Xlinker -export-dynamic";;
 	# -u libsys_s pulls in all symbols in libsys
 	Darwin/*)
 		LINKFORSHARED="$extra_undefs -framework CoreFoundation"