--- indent-2.2.11/config/config.sub.orig	2020-11-08 23:19:24.782365611 -0800
+++ indent-2.2.11/config/config.sub	2020-11-08 23:19:36.510304136 -0800
@@ -1236,6 +1236,7 @@
 	# Each alternative MUST END IN A *, to match a version number.
 	# -sysv* is not here because it comes later, after sysvr4.
 	-gnu* | -bsd* | -mach* | -minix* | -genix* | -ultrix* | -irix* \
+	      | -serenity* \
 	      | -*vms* | -sco* | -esix* | -isc* | -aix* | -sunos | -sunos[34]*\
 	      | -hpux* | -unos* | -osf* | -luna* | -dgux* | -solaris* | -sym* \
 	      | -amigaos* | -amigados* | -msdos* | -newsos* | -unicos* | -aof* \