diff -Nru openshadinglanguage.orig/Makefile openshadinglanguage/Makefile
--- openshadinglanguage.orig/Makefile	2017-12-03 10:18:19.677236000 +1030
+++ openshadinglanguage/Makefile	2017-12-03 10:17:48.847935000 +1030
@@ -3,8 +3,8 @@
 
 PORTNAME=	openshadinglanguage
 PORTVERSION=	1.8.10
-PORTREVISION=	4
 DISTVERSIONPREFIX=	Release-
+PORTREVISION=	5
 CATEGORIES=	graphics devel
 
 MAINTAINER=	FreeBSD@Shaneware.biz
@@ -25,7 +25,7 @@
 GH_PROJECT=	OpenShadingLanguage
 
 CMAKE_ARGS=	-DLLVM_CONFIG:STRING="${LOCALBASE}/bin/llvm-config40" \
-		-DENABLERTTI:BOOL=OFF -DUSE_BOOST_WAVE:BOOL=OFF
+		-DENABLERTTI:BOOL=ON -DUSE_BOOST_WAVE:BOOL=OFF
 USE_LDCONFIG=	yes
 
 post-patch: