$OpenBSD: patch-configure_ac,v 1.1 2010/09/06 18:53:51 nicm Exp $
--- configure.ac.orig	Mon Aug 30 09:36:42 2010
+++ configure.ac	Mon Aug 30 09:37:03 2010
@@ -701,7 +701,7 @@ AH_TEMPLATE([ZSH_NO_XOPEN],
 AC_CACHE_CHECK(if _XOPEN_SOURCE_EXTENDED should not be defined,
 zsh_cv_no_xopen,
 [[case "$host_os" in
-  *openbsd*|*freebsd5*|*freebsd6.[012]*|*aix*)
+  *freebsd5*|*freebsd6.[012]*|*aix*)
   zsh_cv_no_xopen=yes
   ;;
   *)