diff -ur a/config.sub b/config.sub
--- a/config.sub	2021-06-15 17:52:53.000000000 +0200
+++ b/config.sub	2021-11-06 02:02:32.208608392 +0100
@@ -1690,7 +1690,7 @@
 	# Now accept the basic system types.
 	# The portable systems comes first.
 	# Each alternative MUST end in a * to match a version number.
-	gnu* | android* | bsd* | mach* | minix* | genix* | ultrix* | irix* \
+	gnu* | android* | bsd* | mach* | minix* | genix* | ultrix* | serenity* | irix* \
 	     | *vms* | esix* | aix* | cnk* | sunos | sunos[34]* \
 	     | hpux* | unos* | osf* | luna* | dgux* | auroraux* | solaris* \
 	     | sym* |  plan9* | psp* | sim* | xray* | os68k* | v88r* \