Index: head/math/xtensor/Makefile
===================================================================
--- head/math/xtensor/Makefile	(revision 499961)
+++ head/math/xtensor/Makefile	(revision 499962)
@@ -1,35 +1,35 @@
 # $FreeBSD$
 
 PORTNAME=	xtensor
-DISTVERSION=	0.19.4
+DISTVERSION=	0.20.4
 CATEGORIES=	math
 
 MAINTAINER=	yuri@FreeBSD.org
 COMMENT=	Multi-dimensional arrays with broadcasting and lazy computing
 
 LICENSE=	BSD3CLAUSE
 LICENSE_FILE=	${WRKSRC}/LICENSE
 
 BUILD_DEPENDS=	nlohmann-json>0:devel/nlohmann-json \
 		xtl-quant-stack>0:devel/xtl-quant-stack
 RUN_DEPENDS=	nlohmann-json>0:devel/nlohmann-json \
 		xtl-quant-stack>0:devel/xtl-quant-stack
 TEST_DEPENDS=	nlohmann-json>0:devel/nlohmann-json \
 		xtl-quant-stack>0:devel/xtl-quant-stack \
 		googletest>0:devel/googletest
 
 USES=		cmake
 USE_GITHUB=	yes
 GH_ACCOUNT=	QuantStack
 
 NO_BUILD=	yes
 NO_ARCH=	yes
 
 do-test:
 	@${RLN} ${STAGEDIR}${PREFIX}/include ${WRKSRC}/test/staged-include
 	@cd ${WRKSRC}/test && \
 		${SETENV} ${CONFIGURE_ENV} ${CMAKE_BIN} ${CMAKE_ARGS} . && \
 		${MAKE_ENV} ${MAKE_CMD} ${MAKE_ARGS} && \
 		${MAKE_ENV} ${MAKE_CMD} ${MAKE_ARGS} xtest
 
 .include <bsd.port.mk>
Index: head/math/xtensor/distinfo
===================================================================
--- head/math/xtensor/distinfo	(revision 499961)
+++ head/math/xtensor/distinfo	(revision 499962)
@@ -1,3 +1,3 @@
-TIMESTAMP = 1551157617
-SHA256 (QuantStack-xtensor-0.19.4_GH0.tar.gz) = ea0ed42ac27888f4e4acaf99367fbef714373fa586f204e8bc22b8e5335ecf06
-SIZE (QuantStack-xtensor-0.19.4_GH0.tar.gz) = 907251
+TIMESTAMP = 1556176920
+SHA256 (QuantStack-xtensor-0.20.4_GH0.tar.gz) = 5f629fc9b90a6ecd83456a06fe5f209f23c6efe3e81d1b0d6360fc75bf80c221
+SIZE (QuantStack-xtensor-0.20.4_GH0.tar.gz) = 932083
Index: head/math/xtensor/pkg-plist
===================================================================
--- head/math/xtensor/pkg-plist	(revision 499961)
+++ head/math/xtensor/pkg-plist	(revision 499962)
@@ -1,65 +1,67 @@
+include/xtensor/xaccessible.hpp
 include/xtensor/xaccumulator.hpp
 include/xtensor/xadapt.hpp
 include/xtensor/xarray.hpp
 include/xtensor/xassign.hpp
 include/xtensor/xaxis_iterator.hpp
 include/xtensor/xbroadcast.hpp
 include/xtensor/xbuffer_adaptor.hpp
 include/xtensor/xbuilder.hpp
 include/xtensor/xcomplex.hpp
 include/xtensor/xcontainer.hpp
 include/xtensor/xcsv.hpp
 include/xtensor/xdynamic_view.hpp
 include/xtensor/xeval.hpp
 include/xtensor/xexception.hpp
 include/xtensor/xexpression.hpp
 include/xtensor/xexpression_holder.hpp
+include/xtensor/xexpression_traits.hpp
 include/xtensor/xfixed.hpp
 include/xtensor/xfunction.hpp
 include/xtensor/xfunctor_view.hpp
 include/xtensor/xgenerator.hpp
 include/xtensor/xhistogram.hpp
 include/xtensor/xindex_view.hpp
 include/xtensor/xinfo.hpp
 include/xtensor/xio.hpp
 include/xtensor/xiterable.hpp
 include/xtensor/xiterator.hpp
 include/xtensor/xjson.hpp
 include/xtensor/xlayout.hpp
 include/xtensor/xmanipulation.hpp
-include/xtensor/xmasked_value.hpp
 include/xtensor/xmasked_view.hpp
 include/xtensor/xmath.hpp
 include/xtensor/xmime.hpp
 include/xtensor/xnoalias.hpp
 include/xtensor/xnorm.hpp
 include/xtensor/xnpy.hpp
 include/xtensor/xoffset_view.hpp
 include/xtensor/xoperation.hpp
 include/xtensor/xoptional.hpp
 include/xtensor/xoptional_assembly.hpp
 include/xtensor/xoptional_assembly_base.hpp
 include/xtensor/xoptional_assembly_storage.hpp
+include/xtensor/xpad.hpp
 include/xtensor/xrandom.hpp
 include/xtensor/xreducer.hpp
 include/xtensor/xscalar.hpp
 include/xtensor/xsemantic.hpp
 include/xtensor/xshape.hpp
 include/xtensor/xslice.hpp
 include/xtensor/xsort.hpp
 include/xtensor/xstorage.hpp
 include/xtensor/xstrided_view.hpp
 include/xtensor/xstrided_view_base.hpp
 include/xtensor/xstrides.hpp
 include/xtensor/xtensor.hpp
 include/xtensor/xtensor_config.hpp
 include/xtensor/xtensor_forward.hpp
 include/xtensor/xtensor_simd.hpp
 include/xtensor/xutils.hpp
 include/xtensor/xvectorize.hpp
 include/xtensor/xview.hpp
 include/xtensor/xview_utils.hpp
 lib/cmake/xtensor/xtensorConfig.cmake
 lib/cmake/xtensor/xtensorConfigVersion.cmake
 lib/cmake/xtensor/xtensorTargets.cmake
 libdata/pkgconfig/xtensor.pc