Index: head/graphics/perceptualdiff/Makefile
===================================================================
--- head/graphics/perceptualdiff/Makefile	(revision 439419)
+++ head/graphics/perceptualdiff/Makefile	(revision 439420)
@@ -1,23 +1,23 @@
 # Created by: sobomax
 # $FreeBSD$
 
 PORTNAME=	perceptualdiff
 PORTVERSION=	2.1
+DISTVERSIONPREFIX=	v
 CATEGORIES=	graphics
 
 MAINTAINER=	sobomax@FreeBSD.org
 COMMENT=	Program that compares two images
 
 LICENSE=	GPLv2
 
 LIB_DEPENDS=	libfreeimage.so:graphics/freeimage
 
 PLIST_FILES=	bin/perceptualdiff
 
 USE_GITHUB=	yes
 GH_ACCOUNT=	myint
-GH_TAGNAME=	v${PORTVERSION}
 
 USES=		cmake
 
 .include <bsd.port.mk>
Index: head/graphics/perceptualdiff/distinfo
===================================================================
--- head/graphics/perceptualdiff/distinfo	(revision 439419)
+++ head/graphics/perceptualdiff/distinfo	(revision 439420)
@@ -1,3 +1,3 @@
-TIMESTAMP = 1493138500
-SHA256 (myint-perceptualdiff-2.1-v2.1_GH0.tar.gz) = 0dea51046601e4d23dc45a3ec342f1a305baf3bf3328e9ccdae115fe1942f041
-SIZE (myint-perceptualdiff-2.1-v2.1_GH0.tar.gz) = 860932
+TIMESTAMP = 1493154384
+SHA256 (myint-perceptualdiff-v2.1_GH0.tar.gz) = 0dea51046601e4d23dc45a3ec342f1a305baf3bf3328e9ccdae115fe1942f041
+SIZE (myint-perceptualdiff-v2.1_GH0.tar.gz) = 860932