sci-visualization/gnuplot: Switch from Qt4 to Qt5.

Suggested-by: Andreas Eckstein <andreas.eckstein@gmx.net>
Closes: https://bugs.gentoo.org/594570
Package-Manager: Portage-2.3.14, Repoman-2.3.6

sci-visualization/gnuplot/gnuplot-5.0.7.ebuild

@@ -26,7 +26,7 @@ fi
 
 LICENSE="gnuplot bitmap? ( free-noncomm )"
 SLOT="0"
-IUSE="aqua bitmap cairo compat doc examples +gd ggi latex libcaca libcerf lua qt4 readline svga wxwidgets X"
+IUSE="aqua bitmap cairo compat doc examples +gd ggi latex libcaca libcerf lua qt5 readline svga wxwidgets X"
 
 RDEPEND="
 	cairo? (
@@ -41,9 +41,12 @@ RDEPEND="
 			>=dev-texlive/texlive-latexrecommended-2008-r2 ) )
 	libcaca? ( media-libs/libcaca )
 	lua? ( dev-lang/lua:0 )
-	qt4? ( >=dev-qt/qtcore-4.5:4
-		>=dev-qt/qtgui-4.5:4
-		>=dev-qt/qtsvg-4.5:4 )
+	qt5? ( dev-qt/qtcore:5=
+		dev-qt/qtgui:5=
+		dev-qt/qtnetwork:5=
+		dev-qt/qtprintsupport:5=
+		dev-qt/qtsvg:5=
+		dev-qt/qtwidgets:5= )
 	readline? ( sys-libs/readline:0= )
 	libcerf? ( sci-libs/libcerf )
 	svga? ( media-libs/svgalib )
@@ -82,12 +85,6 @@ src_prepare() {
 	# of the gnuplot license
 	sed -i -e "1s/.*/& (Gentoo revision ${PR})/" PATCHLEVEL || die
 
-	# hacky workaround
-	# Please hack the buildsystem if you like
-	if use prefix && use qt4; then
-		append-ldflags -Wl,-rpath,"${EPREFIX}"/usr/$(get_libdir)/qt4
-	fi
-
 	DOC_CONTENTS='Gnuplot no longer links against pdflib, see the ChangeLog
 		for details. You can use the "pdfcairo" terminal for PDF output.'
 	use cairo || DOC_CONTENTS+=' It is available with USE="cairo".'
@@ -126,6 +123,8 @@ src_configure() {
 	tc-export_build_env BUILD_CC
 	export CC_FOR_BUILD=${BUILD_CC}
 
+	use qt5 && append-cxxflags -std=c++11
+
 	econf \
 		--without-pdf \
 		--with-texdir="${TEXMF}/tex/latex/${PN}" \
@@ -143,7 +142,7 @@ src_configure() {
 		$(use_with svga linux-vga) \
 		$(use_with X x) \
 		--enable-stats \
-		$(use_with qt4 qt qt4) \
+		$(use_with qt5 qt qt5) \
 		$(use_enable wxwidgets) \
 		DIST_CONTACT="https://bugs.gentoo.org/" \
 		EMACS=no