--- Makefile.orig	2015-04-22 15:49:19.615050305 +0200
+++ Makefile	2015-04-22 15:50:02.317047137 +0200
@@ -13,6 +13,7 @@
 CONFLICTS?=	courier-0.* postfix-1.* postfix-2.* smail-3.* zmailer-2.* opensmtpd-*
 NEED_ROOT=	yes
 
+USES=	cpe
 WRKSRC=		${WRKDIR}/${PORTNAME}-${PORTVERSION}
 WCONF=		${WRKSRC}/devtools/Site
 SITE=		${FILESDIR}/site.config.m4.pre4