$OpenBSD: patch-libgc_include_private_gc_priv_h,v 1.3 2016/06/26 10:40:28 robert Exp $
--- libgc/include/private/gc_priv.h.orig	Thu Jun  9 17:01:54 2016
+++ libgc/include/private/gc_priv.h	Thu Jun 23 19:29:27 2016
@@ -1979,6 +1979,10 @@ 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
