$OpenBSD: patch-libgc_include_private_gc_priv_h,v 1.2 2014/12/29 10:49:12 robert Exp $
--- libgc/include/private/gc_priv.h.orig	Mon Sep 22 15:23:05 2014
+++ libgc/include/private/gc_priv.h	Sun Dec 28 16:22:49 2014
@@ -1977,6 +1977,10 @@ void GC_err_puts GC_PROTO((GC_CONST char *s));
        /* Linuxthreads itself uses SIGUSR1 and SIGUSR2.			*/
 #      define SIG_SUSPEND SIGPWR
 #    endif
+#   elif defined(GC_OPENBSD_THREADS)
+#     ifndef GC_OPENBSD_UTHREADS
+#       define SIG_SUSPEND SIGXFSZ
+#     endif
 #   else  /* !GC_LINUX_THREADS */
 #     if defined(_SIGRTMIN)
 #       define SIG_SUSPEND _SIGRTMIN + 6
