$OpenBSD: patch-boost_predef_os_bsd_open_h,v 1.1 2021/02/01 12:00:51 rsadowski Exp $

Fix redef of OS_BSD predef.

Index: boost/predef/os/bsd/open.h
--- boost/predef/os/bsd/open.h.orig
+++ boost/predef/os/bsd/open.h
@@ -79,6 +79,7 @@ http://www.boost.org/LICENSE_1_0.txt)
     defined(__OpenBSD__) \
     )
 #   ifndef BOOST_OS_BSD_AVAILABLE
+#       undef BOOST_OS_BSD
 #       define BOOST_OS_BSD BOOST_VERSION_NUMBER_AVAILABLE
 #       define BOOST_OS_BSD_AVAILABLE
 #   endif
