Index: head/graphics/py-open3d-python/Makefile
===================================================================
--- head/graphics/py-open3d-python/Makefile	(revision 549653)
+++ head/graphics/py-open3d-python/Makefile	(revision 549654)
@@ -1,34 +1,38 @@
 # $FreeBSD$
 
 PORTNAME=	open3d-python
 DISTVERSIONPREFIX=	v
 DISTVERSION=	0.2
 PORTREVISION=	4
 CATEGORIES=	graphics
 PKGNAMEPREFIX=	${PYTHON_PKGNAMEPREFIX}
 
 MAINTAINER=	yuri@FreeBSD.org
 COMMENT=	Modern library for 3D data processing (Python binding)
 
 LICENSE=	MIT
 LICENSE_FILE=	${WRKSRC}/../LICENSE
 
 LIB_DEPENDS=	libOpen3D.so:graphics/open3d
 
 USES=		cmake compiler:c++11-lang eigen:3 fortran localbase:ldflags \
 		pkgconfig python
 USE_GITHUB=	yes
 GH_ACCOUNT=	IntelVCL
 GH_PROJECT=	Open3D
 USE_PYTHON=	flavors
 
 CMAKE_ARGS=	-DPYTHON_EXECUTABLE:FILEPATH=${PYTHON_CMD} -DPYTHON_SITE_PACKAGES:STRING=lib/${PYTHON_VERSION}/site-packages
 CMAKE_ON=	BUILD_SHARED_LIBS BUILD_PYTHON_MODULE
 CMAKE_OFF=	BUILD_TESTS BUILD_PYTHON_TESTS BUILD_PYTHON_TUTORIALS BUILD_TINYFILEDIALOGS
 
 WRKSRC_SUBDIR=	src
 LDFLAGS+=	-pthread # https://github.com/IntelVCL/Open3D/issues/510
 
 PLIST_FILES=	${PYTHON_SITELIBDIR}/open3d.so
 
+.if !exists(/usr/include/c++/v1/tr1/experimental/optional)
+BROKEN=		Base C++ compiler is missing the header <experimental/optional>, see bug\#249538
+.endif
+
 .include <bsd.port.mk>