--- Makefile	2015-04-12 17:26:47.932012377 +0200
+++ Makefile	2015-04-12 17:28:37.609979339 +0200
@@ -15,6 +15,7 @@ 
 MAINTAINER=	ehaupt@FreeBSD.org
 COMMENT=	ZOO archive extractor
 
+USES+=	cpe
 EXTRA_DEFINES=	-DSYS_IS_UNIX -DSYS_HAS_MKDIR
 
 PLIST_FILES=	bin/unzoo man/man1/unzoo.1.gz