--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/config/openbsd-libpthread.h	Fri Feb 12 23:39:51 2010 +0900
@@ -0,0 +1,22 @@
+/* LIB_SPEC appropriate for OpenBSD.  Include -lpthread if -pthread is
+   specified on the command line. */
+/*   Copyright (C) 2004 Free Software Foundation, Inc.
+
+   This file is part of GCC.
+
+   GCC is free software; you can redistribute it and/or modify it
+   under the terms of the GNU General Public License as published
+   by the Free Software Foundation; either version 3, or (at your
+   option) any later version.
+
+   GCC is distributed in the hope that it will be useful, but WITHOUT
+   ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+   or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public
+   License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with GCC; see the file COPYING3.  If not see
+   <http://www.gnu.org/licenses/>.  */
+
+#define OBSD_LIB_SPEC "%{!shared:%{pthread:-lpthread} -lc}"
+