--- Makefile.orig	2015-04-10 16:56:34.605943072 +0200
+++ Makefile	2015-04-10 16:58:22.186900289 +0200
@@ -14,7 +14,8 @@
 GNU_CONFIGURE=	yes
 LDFLAGS+=	-L${LOCALBASE}/lib
 CFLAGS+=	-Wno-sign-compare -Wno-error
-USES=	gmake
+USES=	cpe gmake
+CPE_VENDOR=	duckcorp
 INSTALL_TARGET=	SUBDIR=src install-exec
 
 USE_OPENSSL=	yes