$OpenBSD: patch-configure_ac,v 1.3 2016/06/26 10:40:28 robert Exp $
--- configure.ac.orig	Thu Jun  9 17:01:54 2016
+++ configure.ac	Thu Jun 23 19:29:32 2016
@@ -170,7 +170,6 @@ case "$host" in
 		AC_DEFINE(PTHREAD_POINTER_ID)
 		libdl=
 		libgc_threads=pthreads
-		with_sigaltstack=no
 		use_sigposix=yes
 		;;
 	*-*-linux-android*)
