Index: head/devel/gaa/Makefile
===================================================================
--- head/devel/gaa/Makefile	(revision 415318)
+++ head/devel/gaa/Makefile	(revision 415319)
@@ -1,17 +1,18 @@
 # Created by: Dima Sivachenko <dima@chg.ru>
 # $FreeBSD$
 
 PORTNAME=	gaa
 PORTVERSION=	1.6.6
 CATEGORIES=	devel
 MASTER_SITES=	SF/${PORTNAME}/${PORTNAME}/${PORTNAME}-${PORTVERSION}
 
 MAINTAINER=	demon@FreeBSD.org
 COMMENT=	GPL Argument Analyser
 
 GNU_CONFIGURE=	yes
+USES=		bison
 
 post-patch:
 	${REINPLACE_CMD} -e "s/getline/get_line/g" ${WRKSRC}/source/gaa_parser.y
 
 .include <bsd.port.mk>