diff --git a/misc/ncnn/Makefile b/misc/ncnn/Makefile
index 5cbcedb66dad..cd1b196f357d 100644
--- a/misc/ncnn/Makefile
+++ b/misc/ncnn/Makefile
@@ -1,26 +1,31 @@
 # $FreeBSD$
 
 PORTNAME=	ncnn
 DISTVERSION=	20200616
+PORTREVISION=	1
 CATEGORIES=	misc # machine-learning
 
 MAINTAINER=	yuri@FreeBSD.org
 COMMENT=	High-performance neural network inference framework
 
 LICENSE=	BSD3CLAUSE
 LICENSE_FILE=	${WRKSRC}/LICENSE.txt
 
 USES=		cmake compiler:c11
 USE_GITHUB=	yes
 GH_ACCOUNT=	Tencent
 
 OPTIONS_DEFINE=		VULKAN
 OPTIONS_DEFAULT=	VULKAN
 
 VULKAN_DESC=		Vulkan compute support
-VULKAN_CMAKE_BOOL=	NCNN_VULKAN
-VULKAN_BUILD_DEPENDS=	glslangValidator:devel/glslang \
+VULKAN_BUILD_DEPENDS=	glslang>0:devel/glslang \
 			${LOCALBASE}/include/vulkan/vulkan.h:devel/vulkan-headers \
 			${LOCALBASE}/lib/libvulkan.so:graphics/vulkan-loader
+VULKAN_CMAKE_BOOL=	NCNN_VULKAN NCNN_SYSTEM_GLSLANG
+VULKAN_CMAKE_ON=	-DGLSLANG_TARGET_DIR:PATH="${LOCALBASE}/lib/cmake"
+
+post-patch-VULKAN-on:
+	@${REINPLACE_CMD} 's,/glslang,,' ${WRKSRC}/src/gpu.cpp
 
 .include <bsd.port.mk>