our mkdir -p is thread-safe, so use it (tested for a few months)

infrastructure/mk/gnu.port.mk

@@ -1,6 +1,6 @@
 #-*- mode: Fundamental; tab-width: 4; -*-
 # ex:ts=4 sw=4 filetype=make:
-# $OpenBSD: gnu.port.mk,v 1.36 2009/03/14 10:46:56 ajacoutot Exp $
+# $OpenBSD: gnu.port.mk,v 1.37 2010/05/28 10:42:09 espie Exp $
 #	Based on bsd.port.mk, originally by Jordan K. Hubbard.
 #	This file is in the public domain.
 
@@ -69,6 +69,7 @@ MODGNU_configure += ; mkdir -p ${MODGNU_SAVE_CACHE_LOCATION}; \
 .endif
 
 .if ${CONFIGURE_STYLE:L:Mgnu}
+CONFIGURE_ENV += MKDIR_P='mkdir -p'
 .  if ${MODGNU_SAVE_CACHE:L} == "yes"
 CONFIGURE_ARGS += --cache-file=${WRKBUILD}/config.cache
 .  endif