$OpenBSD$
--- src/boehm-gc/include/gc_config_macros.h.orig	Mon Feb 13 18:14:18 2006
+++ src/boehm-gc/include/gc_config_macros.h	Mon Apr 10 07:56:57 2006
@@ -55,7 +55,7 @@
 # if defined(GC_SOLARIS_PTHREADS) || defined(GC_FREEBSD_THREADS) || \
 	defined(GC_IRIX_THREADS) || defined(GC_LINUX_THREADS) || \
 	defined(GC_HPUX_THREADS) || defined(GC_OSF1_THREADS) || \
-	defined(GC_DGUX386_THREADS) || defined(GC_DARWIN_THREADS) || \
+	defined(GC_DGUX386_THREADS) || defined(GC_DARWIN_THREADS) || defined(GC_OPENBSD_PTHREADS) || \
 	defined(GC_AIX_THREADS) || \
         (defined(GC_WIN32_THREADS) && defined(__CYGWIN32__))
 #   define GC_PTHREADS
