--- /usr/portage/mail-filter/mimedefang/mimedefang-2.57.ebuild	2007-06-04 19:35:49.000000000 +0200
+++ /usr/local/portage/mail-filter/mimedefang/mimedefang-2.63.ebuild	2007-12-08 09:55:11.000000000 +0100
@@ -1,6 +1,6 @@
 # Copyright 1999-2007 Gentoo Foundation
 # Distributed under the terms of the GNU General Public License v2
-# $Header: /var/cvsroot/gentoo-x86/mail-filter/mimedefang/mimedefang-2.57.ebuild,v 1.4 2007/06/04 17:28:48 ticho Exp $
+# $Header: $
 
 inherit eutils
 
@@ -19,6 +19,9 @@
 	dev-perl/Digest-SHA"
 
 pkg_setup() {
+	if has_version <mail-mta/postfix-2.4; then
+	    die "You need Postfix 2.4 or higher."
+	fi
 	enewgroup defang
 	enewuser defang -1 -1 -1 defang
 }