diff -Nru openshadinglanguage.orig/distinfo openshadinglanguage/distinfo
--- openshadinglanguage.orig/distinfo	2017-01-26 02:15:06.585053000 +1030
+++ openshadinglanguage/distinfo	2017-01-23 00:46:25.621618000 +1030
@@ -1,2 +1,3 @@
-SHA256 (imageworks-OpenShadingLanguage-Release-1.7.2_GH0.tar.gz) = 9c8b014248db24f1993fb7eb4b022a19a42ec7e81a6a28ade13c52be5941c85b
-SIZE (imageworks-OpenShadingLanguage-Release-1.7.2_GH0.tar.gz) = 13717762
+TIMESTAMP = 1478806482
+SHA256 (imageworks-OpenShadingLanguage-Release-1.7.5_GH0.tar.gz) = 46226af0592297172e856635eac50327255f1a307244162c1feb47581e72a109
+SIZE (imageworks-OpenShadingLanguage-Release-1.7.5_GH0.tar.gz) = 13739852
diff -Nru openshadinglanguage.orig/Makefile openshadinglanguage/Makefile
--- openshadinglanguage.orig/Makefile	2017-01-26 02:15:06.607882000 +1030
+++ openshadinglanguage/Makefile	2017-01-26 02:14:26.007512000 +1030
@@ -2,9 +2,8 @@
 # $FreeBSD$
 
 PORTNAME=	openshadinglanguage
-PORTVERSION=	1.7.2
+PORTVERSION=	1.7.5
 DISTVERSIONPREFIX=	Release-
-PORTREVISION=	2
 CATEGORIES=	graphics devel
 
 MAINTAINER=	FreeBSD@Shaneware.biz
@@ -12,9 +11,10 @@
 
 LICENSE=	BSD3CLAUSE
 
-BUILD_DEPENDS=	llvm-config34:devel/llvm34 \
-		clang34>=3.4_1:lang/clang34
+BUILD_DEPENDS=	llvm-config34:devel/llvm34
 LIB_DEPENDS=	libboost_thread.so:devel/boost-libs \
+		libtinfo.so:devel/ncurses \
+		libImath-2_2.so:graphics/ilmbase \
 		libIlmImf.so:graphics/OpenEXR \
 		libOpenImageIO.so:graphics/openimageio
 RUN_DEPENDS=	llvm-config34:devel/llvm34
@@ -24,20 +24,17 @@
 GH_PROJECT=	OpenShadingLanguage
 
 CMAKE_ARGS=	-DLLVM_CONFIG:STRING="${LOCALBASE}/bin/llvm-config34" \
-		-DENABLERTTI:BOOL=ON
+		-DENABLERTTI:BOOL=ON -DOSL_BUILD_CPP11:BOOL=OFF \
+		-DOSL_BUILD_CPP14:BOOL=OFF
 USE_LDCONFIG=	yes
-USES=		bison cmake:outsource compiler:c11
+USES=		bison cmake:outsource
 
 .include <bsd.port.options.mk>
 
-.if ${ARCH} == powerpc
-USE_GCC=	yes
-.endif
-
-.if ${OSVERSION} < 1000033
-BUILD_DEPENDS+=	flex>=2.5.37:textproc/flex
-CMAKE_ARGS+=	-DFLEX_EXECUTABLE:STRING=${LOCALBASE}/bin/flex
-CXXFLAGS+=	-I${LOCALBASE}/include/flex
+.if ${OSVERSION} > 1200000
+# llvm-as34 fails to build llvm_ops.s generated by clang4
+# disabling this option uses clang4 instead of llvm-as34
+CMAKE_ARGS+=  -DUSE_LLVM_BITCODE:BOOL=OFF
 .endif
 
 post-patch: