diff --git a/graphics/sketch/Makefile b/graphics/sketch/Makefile
index 0b3934026568..2e649faf90a8 100644
--- a/graphics/sketch/Makefile
+++ b/graphics/sketch/Makefile
@@ -6,11 +6,13 @@ PORTVERSION=	0.3.7
 CATEGORIES=	graphics
 MASTER_SITES=	http://www.frontiernet.net/~eugene.ressler/
 
-MAINTAINER=	ports@FreeBSD.org
+MAINTAINER=	joerg@FreeBSD.org
 COMMENT=	3D Scene Description Translator
 
 LICENSE=	GPLv3
 
+BUILD_DEPENDS=	bison:${PORTSDIR}/devel/bison
+
 MAKEFILE=	makefile
 ALL_TARGET=
 USES=		dos2unix gmake perl5 tar:tgz
@@ -18,8 +20,6 @@ USE_PERL5=	build
 
 PLIST_FILES=	bin/sketch
 
-NO_STAGE=	yes
-
 OPTIONS_DEFINE=	DOCS EXAMPLES
 
 .include <bsd.port.options.mk>
@@ -45,23 +45,23 @@ PORTEXAMPLES=	*.sk
 post-patch:
 	@${REINPLACE_CMD} -e 's/^CC =.*//' \
 		-e 's/$$(CC)/$$(CC) $$(CFLAGS)/g' \
-		-e 's/^YACC =.*/YACC = yacc/' ${WRKSRC}/${MAKEFILE}
+		-e 's/^YACC =.*/YACC = bison/' ${WRKSRC}/${MAKEFILE}
 
 do-install:
-	${INSTALL_PROGRAM} ${WRKSRC}/${PORTNAME} ${PREFIX}/bin/
+	${INSTALL_PROGRAM} ${WRKSRC}/${PORTNAME} ${STAGEDIR}/${PREFIX}/bin/
 
 .if ${PORT_OPTIONS:MDOCS}
-	@${MKDIR} ${DOCSDIR}
-	${INSTALL_DATA} ${DOC_FILES1:S|^|${DOCSRCDIR1}/|} ${DOCSDIR}
-	@${MKDIR} ${DOCSDIR2}
-	${INSTALL_DATA} ${DOC_FILES2:S|^|${DOCSRCDIR2}/|} ${DOCSDIR2}
-	@${MKDIR} ${DOCSDIR3}
-	${INSTALL_DATA} ${DOC_FILES3:S|^|${DOCSRCDIR3}/|} ${DOCSDIR3}
+	@${MKDIR} ${STAGEDIR}/${DOCSDIR}
+	${INSTALL_DATA} ${DOC_FILES1:S|^|${DOCSRCDIR1}/|} ${STAGEDIR}/${DOCSDIR}
+	@${MKDIR} ${STAGEDIR}/${DOCSDIR2}
+	${INSTALL_DATA} ${DOC_FILES2:S|^|${DOCSRCDIR2}/|} ${STAGEDIR}/${DOCSDIR2}
+	@${MKDIR} ${STAGEDIR}/${DOCSDIR3}
+	${INSTALL_DATA} ${DOC_FILES3:S|^|${DOCSRCDIR3}/|} ${STAGEDIR}/${DOCSDIR3}
 .endif
 
 .if ${PORT_OPTIONS:MEXAMPLES}
-	@${MKDIR} ${EXAMPLESDIR}
-	cd ${WRKSRC}/Data && ${INSTALL_DATA} ${PORTEXAMPLES} ${EXAMPLESDIR}
+	@${MKDIR} ${STAGEDIR}/${EXAMPLESDIR}
+	cd ${WRKSRC}/Data && ${INSTALL_DATA} ${PORTEXAMPLES} ${STAGEDIR}/${EXAMPLESDIR}
 .endif
 
 .include <bsd.port.mk>