diff --git a/math/xgraph/Makefile b/math/xgraph/Makefile
index c4b32efb0ee5..62424b4785f2 100644
--- a/math/xgraph/Makefile
+++ b/math/xgraph/Makefile
@@ -11,10 +11,18 @@ DISTNAME=	xgraph-11
 MAINTAINER=	ports@FreeBSD.org
 COMMENT=	Program that helps you plot graphs
 
+LICENSE=	XGRAPH
+LICENSE_NAME=	xgraph license
+LICENSE_FILE=	${WRKSRC}/COPYING
+LICENSE_PERMS=	dist-mirror dist-sell pkg-mirror pkg-sell auto-accept
+
 USES=		imake tar:Z
 USE_XORG=	x11 xext
 WRKSRC=		${WRKDIR}/${PORTNAME}
 
+post-extract:
+	@${SED} -ne '2,19 {s|^ \* *||;p;}' < ${WRKSRC}/copyright.h > ${WRKSRC}/COPYING
+
 post-install:
 	@${MKDIR} ${STAGEDIR}${PREFIX}/share/examples/xgraph
 	${INSTALL_DATA} ${WRKSRC}/examples/*.xg ${STAGEDIR}${PREFIX}/share/examples/xgraph