Index: science/InsightToolkit/Makefile
===================================================================
--- science/InsightToolkit/Makefile
+++ science/InsightToolkit/Makefile
@@ -53,8 +53,16 @@
 EXAMPLES_CMAKE_ON=	-DBUILD_EXAMPLES:BOOL=ON
 TESTING_CMAKE_ON=	-DBUILD_TESTING:BOOL=ON
 
+.include <bsd.port.pre.mk>
+
+.if ${CHOSEN_COMPILER_TYPE} == gcc
+PLIST_SUB+=	CLANG="@comment " GCC=""
+.else
+PLIST_SUB+=	CLANG="" GCC="@comment "
+.endif
+
 post-extract:
 	${MV} ${WRKDIR}/${PORTNAME}-${PORTVERSION}/.ExternalData/* ${WRKSRC}/.ExternalData/
 	${RM} -r ${WRKDIR}/${PORTNAME}-${PORTVERSION}
 
-.include <bsd.port.mk>
+.include <bsd.port.post.mk>
Index: science/InsightToolkit/pkg-plist
===================================================================
--- science/InsightToolkit/pkg-plist
+++ science/InsightToolkit/pkg-plist
@@ -138,7 +138,8 @@
 include/ITK-%%ITK_VER%%/blas/ztrmv.h
 include/ITK-%%ITK_VER%%/blas/ztrsv.h
 include/ITK-%%ITK_VER%%/cached-powers.h
-include/ITK-%%ITK_VER%%/compilers/ITK_COMPILER_INFO_Clang_CXX.h
+%%CLANG%%include/ITK-%%ITK_VER%%/compilers/ITK_COMPILER_INFO_Clang_CXX.h
+%%GCC%%include/ITK-%%ITK_VER%%/compilers/ITK_COMPILER_INFO_GNU_CXX.h
 include/ITK-%%ITK_VER%%/compilers/VXL_COMPILER_INFO_AppleClang_CXX.h
 include/ITK-%%ITK_VER%%/compilers/VXL_COMPILER_INFO_Clang_CXX.h
 include/ITK-%%ITK_VER%%/compilers/VXL_COMPILER_INFO_GNU_CXX.h