--- /dev/null
+From 2f77edf05ed02955dc08821f322a529063dbfa28 Mon Sep 17 00:00:00 2001
+From: Bernd Waibel <waebbl@gmail.com>
+Date: Sun, 19 Apr 2020 15:39:45 +0200
+Subject: [PATCH] Respect user pre-defined CXXFLAGS
+
+Signed-off-by: Bernd Waibel <waebbl@gmail.com>
+---
+ CMakeLists.txt | 4 ++--
+ 1 file changed, 2 insertions(+), 2 deletions(-)
+
+diff --git a/CMakeLists.txt b/CMakeLists.txt
+index 047456f..6733b7d 100644
+--- a/CMakeLists.txt
++++ b/CMakeLists.txt
+@@ -224,7 +224,7 @@ if(NOT WIN32)
+ endif(NOT YAF_BINDINGS_RUBY_DIR)
+
+ # build flags
+- set(CMAKE_CXX_FLAGS "-Wall" CACHE STRING "Default compiler flags" FORCE)
++ set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wall" CACHE STRING "Default compiler flags" FORCE)
+
+ if(USER_RELEASE_OPTIMIZATION_FLAGS)
+ set(YAF_CXX_FLAGS_RELEASE ${USER_RELEASE_OPTIMIZATION_FLAGS})
+@@ -263,7 +263,7 @@ else(NOT WIN32)
+
+ # build flags
+ if(MINGW)
+- set(CMAKE_CXX_FLAGS "-Wall" CACHE STRING "Default compiler flags" FORCE)
++ set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wall" CACHE STRING "Default compiler flags" FORCE)
+
+ if(USER_RELEASE_OPTIMIZATION_FLAGS)
+ set(YAF_CXX_FLAGS_RELEASE ${USER_RELEASE_OPTIMIZATION_FLAGS})
+--
+2.26.1
+
--- /dev/null
+# Copyright 1999-2020 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=7
+
+PYTHON_COMPAT=( python3_6 )
+
+# doesn't build with ninja when qt5 and python USE flags are both enabled
+CMAKE_MAKEFILE_GENERATOR="emake"
+
+inherit cmake flag-o-matic python-single-r1
+
+DESCRIPTION="A free open-source montecarlo raytracing engine"
+HOMEPAGE="http://www.yafaray.org"
+SRC_URI="https://github.com/YafaRay/Core/archive/v${PV}.tar.gz -> ${PN}-core-${PV}.tar.gz
+ blender? ( https://github.com/YafaRay/Blender-Exporter/archive/v${PV}.tar.gz -> ${PN}-blender-exporter-${PV}.tar.gz )"
+
+S="${WORKDIR}/Core-${PV}"
+
+LICENSE="blender? ( GPL-2+ ) LGPL-2.1"
+SLOT="0"
+KEYWORDS="~amd64 ~x86"
+IUSE="blender +fastmath +fasttrig jpeg opencv openexr png +python qt5 tiff truetype"
+RESTRICT="test"
+
+REQUIRED_USE="
+ blender? ( python )
+ python? ( ${PYTHON_REQUIRED_USE} )
+"
+
+# Note: according to upstream, the blender plugin doesn't work with blender-2.8 (yet).
+RDEPEND="
+ dev-libs/boost:=[nls]
+ dev-libs/libxml2:2
+ sys-libs/zlib
+ jpeg? ( virtual/jpeg:0 )
+ opencv? ( >=media-libs/opencv-3.1.0:= )
+ openexr? ( >=media-libs/openexr-2.2.0:= )
+ png? ( media-libs/libpng:0= )
+ python? (
+ ${PYTHON_DEPS}
+ blender? ( ~media-gfx/blender-2.79b[${PYTHON_SINGLE_USEDEP}] )
+ )
+ qt5? ( dev-qt/qtwidgets:5 )
+ tiff? ( media-libs/tiff:0 )
+ truetype? ( media-libs/freetype:2 )
+"
+DEPEND="${RDEPEND}"
+BDEPEND="python? ( dev-lang/swig )"
+
+PATCHES=(
+ "${FILESDIR}/${P}-0001-Respect-user-pre-defined-CXXFLAGS.patch"
+)
+
+DOCS=( AUTHORS CHANGELOG CODING INSTALL README )
+
+pkg_setup() {
+ use python && python-single-r1_pkg_setup
+}
+
+src_prepare() {
+ append-flags -pthread
+ append-ldflags -pthread
+
+ cmake_src_prepare
+
+ if use blender; then
+ # fix PLUGIN_PATH
+ sed -e "s/PLUGIN_PATH = os.path.join(__path__\[0\], 'bin'/PLUGIN_PATH = os.path.join(__path__\[0\], '"$(get_libdir)"'/" \
+ -e "s/@YAFARAY_BLENDER_EXPORTER_VERSION@/v"${PV}"/" \
+ -i "${WORKDIR}"/Blender-Exporter-${PV}/__init__.py || die "patching startup file failed"
+ fi
+}
+
+src_configure() {
+ local mycmakeargs=(
+ # enabling BLENDER_ADDON doesn't build anything, but set's some wierd
+ # installation paths, so keep it off and install the files manually.
+ -DBLENDER_ADDON=OFF
+ -DCMAKE_SKIP_RPATH=ON # NULL DT_RUNPATH security problem
+ -DFAST_MATH=$(usex fastmath)
+ -DFAST_TRIG=$(usex fasttrig)
+ -DWITH_Freetype=$(usex truetype)
+ -DWITH_JPEG=$(usex jpeg)
+ -DWITH_OpenCV=$(usex opencv)
+ -DWITH_OpenEXR=$(usex openexr)
+ -DWITH_PNG=$(usex png)
+ -DWITH_QT=$(usex qt5)
+ -DWITH_TIFF=$(usex tiff)
+ -DWITH_XML_LOADER=ON # internal
+ -DWITH_YAF_PY_BINDINGS=$(usex python)
+ -DWITH_YAF_RUBY_BINDINGS=OFF
+ -DYAF_LIB_DIR=$(get_libdir)
+ )
+
+ if use python; then
+ mycmakeargs+=( -DYAF_PY_VERSION=${EPYTHON#python} )
+ fi
+
+ cmake_src_configure
+}
+
+src_install() {
+ cmake_src_install
+
+ if use python; then
+ python_domodule "${BUILD_DIR}/src/bindings/yafaray_v3_interface.py"
+ mv "${ED}"/usr/$(get_libdir)/_yafaray_v3_interface.so "${ED}"/$(python_get_sitedir)/ || die
+ rm -v "${ED}"/usr/$(get_libdir)/yafaray_v3_interface.py || die
+
+ if use qt5; then
+ python_domodule "${BUILD_DIR}/src/bindings/yafqt.py"
+ mv "${ED}"/usr/$(get_libdir)/_yafqt.so "${ED}"/$(python_get_sitedir)/ || die
+ rm -v "${ED}"/usr/$(get_libdir)/yafqt.py || die
+ fi
+ fi
+
+ rm -rv "${ED}"/usr/share/doc/${PN} || die
+
+ if use blender; then
+ pushd "${WORKDIR}/Blender-Exporter-${PV}" || die
+ # grab blender version number for plugin directory
+ local blender_plugin_dir=$(best_version media-gfx/blender)
+ blender_plugin_dir=${blender_plugin_dir##*/} # remove category
+ blender_plugin_dir=${blender_plugin_dir#*-} # remove package name
+ blender_plugin_dir=${blender_plugin_dir%%-*} # remove revision number if exists
+ insinto /usr/share/blender/${blender_plugin_dir}/scripts/addons/yafaray_v3
+ doins -r .
+ popd || die
+ fi
+}
+
+pkg_postinst() {
+ einfo "To confirm your installation is working as expected, run"
+ einfo "yafaray-xml with /usr/share/yafaray/tests/test01/test01.xml"
+ einfo "as an input file, then compare the result to"
+ einfo "'/usr/share/yafaray/tests/test01/test01 - expected render result.png'"
+ if use blender; then
+ elog
+ elog "To use within Blender, navigate to File -> User Preferences -> Add-ons (tab)"
+ elog "and enable 'Render: YafaRay v3 Exporter'. This will make YafaRay available"
+ elog "in the render engines drop-down."
+ fi
+}
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