$OpenBSD: patch-boehm-gc_include_gc_config_macros_h,v 1.1.1.1 2011/11/14 12:45:55 pascal Exp $
--- boehm-gc/include/gc_config_macros.h.orig	Sat Nov 12 09:56:59 2011
+++ boehm-gc/include/gc_config_macros.h	Sat Nov 12 09:57:55 2011
@@ -55,6 +55,10 @@
 #   define GC_FREEBSD_THREADS
 #   define GC_PTHREADS
 # endif
+# if !defined(GC_PTHREADS) && defined(__OpenBSD__)
+#   define GC_FREEBSD_THREADS
+#   define GC_PTHREADS
+# endif
 # if defined(DGUX) && (defined(i386) || defined(__i386__))
 #   define GC_DGUX386_THREADS
 #   define GC_PTHREADS