diff -Naur devel/cmake.orig/Makefile devel/cmake/Makefile
--- devel/cmake.orig/Makefile	2016-11-10 12:54:18.213258000 +0100
+++ devel/cmake/Makefile	2016-11-10 12:57:56.928767000 +0100
@@ -18,18 +18,20 @@
 CONFIGURE_ARGS=	--prefix=${PREFIX} \
 		--datadir="/${DATADIR_REL}" \
 		--docdir="/${DOCSDIR_REL}" \
-		--system-libs \
 		--parallel=${MAKE_JOBS_NUMBER} \
 		--init="${PATCHDIR}/InitialCache.cmake"
 
 .if !defined(CMAKE_MODULES)
-OPTIONS_DEFINE=	DOCS MANPAGES
-OPTIONS_DEFAULT=MANPAGES
+OPTIONS_DEFINE=	DOCS MANPAGES PORTLIBS
+OPTIONS_DEFAULT=MANPAGES PORTLIBS
 OPTIONS_SUB=	yes
 USES+=		execinfo libarchive ncurses
 HAS_CONFIGURE=	yes
 
-LIB_DEPENDS=	libcurl.so:ftp/curl \
+PORTLIBS_DESC=	use curl/expat/jsonpp from ports
+PORTLIBS_CONFIGURE_ON=	--system-libs
+
+PORTLIBS_LIB_DEPENDS=	libcurl.so:ftp/curl \
 		libexpat.so:textproc/expat2 \
 		libjsoncpp.so:devel/jsoncpp
 RUN_DEPENDS=	${LOCALBASE}/share/cmake/Modules/CMake.cmake:devel/cmake-modules