sci-libs/vtk: revert "sci-libs/vtk: drop 9.2.5, 9.2.6-r1"

This reverts commit 4b6bf5d12417a8719f34364098513f25a81be783.

Signed-off-by: Andrew Ammerlaan <andrewammerlaan@gentoo.org>

3 files changed, 1505 insertions, 0 deletions

diff --git a/sci-libs/vtk/Manifest b/sci-libs/vtk/Manifest
index 778c263572f8..51b1e50afdd1 100644
--- a/sci-libs/vtk/Manifest
+++ b/sci-libs/vtk/Manifest
@@ -1,6 +1,18 @@
+DIST VTK-9.2.5.tar.gz 53807732 BLAKE2B 8d25ec8f23c12868b2321eca84644dbf44704e58b7b79b2fd3a1260f7a240a78e4007fd99633ba93359103afc8ec00c7fa84f62778aed3d3361e1774a87b5626 SHA512 b1f225fb2589449621fd32bb0fc3f4817478d972cdccf7a9a376f1c17e93d5bd0a0511cdaa8587568a4baac9dfa8b5ffb9041442e221cd98d8f55e9981b6fcbf
+DIST VTK-9.2.6.tar.gz 53810904 BLAKE2B e3f9736a9b38415e0edd4b4c4bfe83aa154221c3c2c582e527996f88386b1b4d7864ddd2a364c0e83596ff45902cb7cde548ac3a4eebe06c2e43925c2608c4d3 SHA512 f2328caae959d583299b7fd57205f3dd76f87c8c1ee78653e85d44cab085295bf7bf88b3f6a2b960a57df96ccb32049337ebccb067ecde6d84d25eda636196bc
 DIST VTK-9.3.0.tar.gz 99932810 BLAKE2B 59c2cdfe1c2525ac0f89df77a668783d928b55d2e72b42df45ea9b789da1bb150d52ce4108f2bc39cb8840cdd1998f57d3aedf96c72e402f6115d9efeebf4486 SHA512 2722dc8186779df1af5c534f26b20186ea33cb3bca2cef8cb333542b12e738382616e26e8d4d0341cb98c30403f8a896d77ddb04adb07e26d0d548c4a34b7d2f
+DIST VTKData-9.2.5.tar.gz 594016050 BLAKE2B 7f03f5640ee648275a9771f990f98a3b5dfee10c0e291b353e6f067a098d50e2653c577b7c9c4e19c1d554e14469968014d1dfe9e70a91ecbff75397a53c9be9 SHA512 c06264c10bf78943753e58b9cb034d56b65570995741020dc58d5703525cdd4842d680fb6e185fa8fc39b72225ea6b29d8d632c0327f4145a7e2b79f3f702ec3
+DIST VTKData-9.2.6.tar.gz 594029678 BLAKE2B b3d6990a8098d9bec02a031b6d804049ce649bcd58fbcd74001e893ba41159e49f4dea74c5957737098a39a399d347b3bc65db4feadf152dd3fb8e705da16eb4 SHA512 5c5f2b365777733180a63daff224da7055e1c2911eb5e4efda26e38b9ac01cb8e886cf7e71c45ac83347642caf1786e72bb469c22954ffbbb6e2c317fc6b4080
 DIST VTKData-9.3.0.tar.gz 612388942 BLAKE2B 66d73ddaf5f2ddf52cf5c6dda5a918a86ae630df207983534478c92a66c39e38b1f4abfb93900b36899a93ad0e26260763573e925bd128c1646a1bc3bef8c54d SHA512 385d609c2adc1746c073690b58a3fc25e496946c03f08e6c9e0a69ee406cee447e66d267986c3e5ba9006dd1cb0015b68134bb3c375ae41aef8f3b1e0d923d51
+DIST VTKDataFiles-9.2.5.tar.gz 609038837 BLAKE2B e6a5aa5a865664cf407914c9598497f6304b914748ce9d9145b5b7d53f5897b4056b6f7615bb8221c9a9747caf13ba632e21b060b1c8963bb7d6b257bb1da559 SHA512 c0cf7e0fb79f626e25946f1154d9e4c3e7ec995a823a01fc9638976f89af26ae8978a5b6c8a78d62f42f7f81b5fbe0cddc6afc5836c214f3dcaddb917a1ccc79
+DIST VTKDataFiles-9.2.6.tar.gz 609045751 BLAKE2B c8a4a8472dcc05f5b1d35c8f6923b4ed2e7adb593a3037ae7673a5e674583ef9ccc5bc1ec8cf29e87fd5b168c0bba5ed27b89c51fe2e5da432ef5d50e415af94 SHA512 f7c104641d25126956a50671934c10b25589e435d7cce6a5107c8dcf83a81f48ed3ae8a325b635f341a5a47579f9200689aa5eb34fe0d1c37acddfeedd33cd01
 DIST VTKDataFiles-9.3.0.tar.gz 628646039 BLAKE2B c2a4e875536c0b06f1edc8a8df17defbe1038067d7a04fc07e71ea49cad46139ef25f64d4b434a095ced16a7ff39d5346d34c528c099ea2e126c9f29afe92482 SHA512 c6788acfa790ce6b02aa5545fa4e411d00896b7542416c18b5e5955909f26a8fab9267e44db1c2a86f95f7a7f093695453f3fd0ec4e2c9a73449f9caf3fc09d5
+DIST VTKLargeData-9.2.5.tar.gz 247523496 BLAKE2B edc785e271ba605c730b9c8d9d62d2d95d818ebf18e4b20468c247187720a27897ecbf701e1eff61ba135545e6ea8f573ef120206813ee5ca11be33d8c5ff728 SHA512 7a994024aa42b48d3633cdcc528d89a2e7e07bcc47d01a0001578720dbc2eb991b90dc2f9caafe8f26a1f10185efb1bc2c0506f799da2b96e63ba08cb564117d
+DIST VTKLargeData-9.2.6.tar.gz 247521022 BLAKE2B ee6e5f627a5cb96aac6a53b7ff14d4a40f1e243a095c7d145412d899ab9d509af5a62ab889fc48c96ff78359443afbeecfa70cb937affdad7225071374b28bec SHA512 f0b71baa4e346746e186c6a0cc93588d227b91cd4993ee6afe15708006250b0b3aa9447822845e01432728c12af56c68a213831b6dc809807ca341ff6912f55f
 DIST VTKLargeData-9.3.0.tar.gz 247520869 BLAKE2B e01f3d0997d0b328d6c5909d6b891443c1246bdbc36aa978004a1d4bb2770f7923afed2c0d78f7844aae95e067425b9dd25a1c47601c8137ba0a8a958b708cab SHA512 d87eb0fb4ce27ae9f4363c54bb711e66c5d2dbcdf508cb5fae9fcc1574407df2816f29d20037297b834440cd8a54fcf8e1d6db14700054f057bff2fe48404d33
+DIST VTKLargeDataFiles-9.2.5.tar.gz 247506616 BLAKE2B 45cd462a11dfa65260a5aa178b2004636eb8ec000af9103fd2fc64ca55b0f607cdf39c40f5f0a9ef843b7b2e468e0f84a34dafb8b8655efce5c8d39c80961422 SHA512 da96e4f1d0e21bc597832d8cd0730dcdd8a8f7d6c1f41f74ec41a7a1d0b2a2d61e86bcb5fade7d3210b9d66cae975b537e25280767e37fe08e0965b3e98c1cae
+DIST VTKLargeDataFiles-9.2.6.tar.gz 247505945 BLAKE2B dafec016a17bc4371972e85fe95e5032f385ef090ca7f3cc4e060976798c18015e34d74aa008a0532a37b3a51df406886a1d70c2eae18f6092a1c16cc861a81a SHA512 5266d7761987d651e1185e7a8fcc556634e129bb2dab892f8bba0e408a950f38c3f96c521a2079bfdc16a6cefb7b4cebc0b63aea945c4f3f0b6a99c55d638197
 DIST VTKLargeDataFiles-9.3.0.tar.gz 247503839 BLAKE2B 68007af36148eaae43fc0fd75b9f8d3b165c977b7bc44efa4ce7077dc4977514f49a4d7d5e4a9e43fc9dec6562d741bdee5df87efa285b3361f865023da14f55 SHA512 f7def947ff492acbfdaa3d360064c42fdd3fedab27fd5d7bed1dbf8054b814cc8843ba0fed7078926648d1e8949235b877de97747be079ea478b79558975e6ea
+DIST vtkDocHtml-9.2.5.tar.gz 158865725 BLAKE2B ccfb6276955bda567e7f2b6fdc5e3e601766bae0314821c243a3d009e1557c5732bfbab59358670c4bc6cd598ba80c284971763e5279bc53c37d954ec30fcc03 SHA512 7901e9fb987ef3b88e8c507ecc7538b551c81d04a9cc65a84ff43b40dc1aeca2a694dd9842a030979a1370873b9fed0c8746a0634b486566086d7784a19181d6
+DIST vtkDocHtml-9.2.6.tar.gz 158833419 BLAKE2B 04686ee0373191fec454738b5e745f3f6d913120dd55727732ab31a021eeaf1395e6a39ee0e2a943c80dc9d32a929dacfc1325afad5a412964dabb4eda32c898 SHA512 e72cfda5cfeb3df0f915f6515bbd34bcb32052af940760cfb1c9845a5c0a81fae38837fb2e192eb95446cd27b65b37b79263f5396631e4665c9d8c57455dcf43
 DIST vtkDocHtml-9.3.0.tar.gz 165538725 BLAKE2B 27874998679090d5442ecb3a394b53db05a0215cfee9f912bd01af1d5567efc51b4f56dacb960401195da4f3d385b335bbefc922a45d0199c99d619df0941f08 SHA512 8bf9cc87c4653a65ccc39d88d70b421a7b4353986d380cbf558cbf6e8a96435695a5d54aa7ce5bb1240cb46ca0fd9225a51183a39d1af1101d3f2876a2afc10b
diff --git a/sci-libs/vtk/vtk-9.2.5.ebuild b/sci-libs/vtk/vtk-9.2.5.ebuild
new file mode 100644
index 000000000000..7460dc7f2461
--- /dev/null
+++ b/sci-libs/vtk/vtk-9.2.5.ebuild
@@ -0,0 +1,746 @@
+# Copyright 1999-2023 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=8
+
+# TODO:
+# - add USE flag for remote modules? Those modules can be downloaded
+#	properly before building.
+# - replace usex by usev where applicable
+
+PYTHON_COMPAT=( python3_{9..11} )
+WEBAPP_OPTIONAL=yes
+WEBAPP_MANUAL_SLOT=yes
+
+inherit check-reqs cmake cuda java-pkg-opt-2 multiprocessing python-single-r1 toolchain-funcs virtualx webapp
+
+# Short package version
+MY_PV="$(ver_cut 1-2)"
+
+DESCRIPTION="The Visualization Toolkit"
+HOMEPAGE="https://www.vtk.org/"
+SRC_URI="
+	https://www.vtk.org/files/release/${MY_PV}/VTK-${PV}.tar.gz
+	https://www.vtk.org/files/release/${MY_PV}/VTKData-${PV}.tar.gz
+	https://www.vtk.org/files/release/${MY_PV}/VTKDataFiles-${PV}.tar.gz
+	doc? ( https://www.vtk.org/files/release/${MY_PV}/vtkDocHtml-${PV}.tar.gz )
+	examples? (
+		https://www.vtk.org/files/release/${MY_PV}/VTKLargeData-${PV}.tar.gz
+		https://www.vtk.org/files/release/${MY_PV}/VTKLargeDataFiles-${PV}.tar.gz
+	)
+	test? (
+		https://www.vtk.org/files/release/${MY_PV}/VTKLargeData-${PV}.tar.gz
+		https://www.vtk.org/files/release/${MY_PV}/VTKLargeDataFiles-${PV}.tar.gz
+	)
+"
+S="${WORKDIR}/VTK-${PV}"
+
+LICENSE="BSD LGPL-2"
+SLOT="0/${MY_PV}"
+KEYWORDS="amd64 ~arm ~arm64 ~x86 ~amd64-linux ~x86-linux"
+# TODO: Like to simplifiy these. Mostly the flags related to Groups.
+IUSE="all-modules boost cuda debug doc examples ffmpeg freetype gdal imaging
+	java las +logging mpi mysql odbc openmp openvdb pdal postgres python qt5
+	qt6 +rendering sdl tbb test +threads tk video_cards_nvidia views vtkm web"
+
+RESTRICT="!test? ( test )"
+
+REQUIRED_USE="
+	all-modules? (
+		boost ffmpeg freetype gdal imaging las mysql odbc openvdb pdal
+		postgres rendering views
+	)
+	cuda? ( video_cards_nvidia vtkm )
+	java? ( rendering )
+	python? ( ${PYTHON_REQUIRED_USE} )
+	qt5? ( rendering )
+	qt6? ( rendering )
+	sdl? ( rendering )
+	tk? ( python rendering )
+	web? ( python )
+"
+
+# for <pegtl-3 dependency see
+# https://discourse.vtk.org/t/compilation-errors-related-to-pegtl-proj/5929
+# eigen, nlohmann_json, pegtl and utfcpp are referenced in the cmake files
+# and need to be available when VTK consumers configure the dependencies.
+RDEPEND="
+	app-arch/lz4:=
+	app-arch/xz-utils
+	dev-cpp/eigen
+	dev-cpp/nlohmann_json
+	dev-db/sqlite:3
+	dev-libs/double-conversion:=
+	dev-libs/expat
+	dev-libs/icu:=
+	dev-libs/jsoncpp:=
+	>=dev-libs/libfmt-8.1.1:=
+	dev-libs/libxml2:2
+	dev-libs/libzip:=
+	<dev-libs/pegtl-3
+	dev-libs/pugixml
+	dev-libs/utfcpp
+	media-libs/freetype
+	media-libs/libjpeg-turbo
+	>=media-libs/libharu-2.4.2:=
+	media-libs/libogg
+	media-libs/libpng:=
+	media-libs/libtheora
+	media-libs/tiff:=
+	>=sci-libs/cgnslib-4.1.1:=[hdf5,mpi=]
+	sci-libs/hdf5:=[mpi=]
+	sci-libs/proj:=
+	sci-libs/netcdf:=[mpi=]
+	sys-libs/zlib
+	boost? ( dev-libs/boost:=[mpi?] )
+	cuda? ( dev-util/nvidia-cuda-toolkit:= )
+	ffmpeg? ( media-video/ffmpeg:= )
+	freetype? ( media-libs/fontconfig )
+	gdal? ( sci-libs/gdal:= )
+	java? ( >=virtual/jdk-1.8:* )
+	las? ( sci-geosciences/liblas )
+	mpi? ( virtual/mpi[cxx,romio] )
+	mysql? ( dev-db/mariadb-connector-c )
+	odbc? ( dev-db/unixODBC )
+	openvdb? ( media-gfx/openvdb:= )
+	pdal? ( <sci-libs/pdal-2.6.0:= )
+	postgres? ( dev-db/postgresql:= )
+	python? (
+		${PYTHON_DEPS}
+		$(python_gen_cond_dep 'mpi? ( dev-python/mpi4py[${PYTHON_USEDEP}] )')
+	)
+	qt5? (
+		dev-qt/qtcore:5
+		dev-qt/qtopengl:5
+		dev-qt/qtquickcontrols2:5
+		dev-qt/qtsql:5
+		dev-qt/qtwidgets:5
+	)
+	qt6? (
+		dev-qt/qtbase:6[gui,opengl,sql,widgets]
+		dev-qt/qtdeclarative:6[opengl]
+		dev-qt/qtshadertools:6
+		x11-libs/libxkbcommon
+	)
+	sdl? ( media-libs/libsdl2 )
+	rendering? (
+		media-libs/glew:=
+		virtual/opengl
+		x11-libs/gl2ps
+		x11-libs/libICE
+		x11-libs/libXcursor
+		x11-libs/libXext
+	)
+	tbb? ( dev-cpp/tbb:= )
+	tk? ( dev-lang/tk:= )
+	video_cards_nvidia? ( x11-drivers/nvidia-drivers[tools,static-libs] )
+	views? (
+		x11-libs/libICE
+		x11-libs/libXext
+	)
+	web? ( ${WEBAPP_DEPEND} )
+"
+
+# for <pegtl-3 dependency see
+# https://discourse.vtk.org/t/compilation-errors-related-to-pegtl-proj/5929
+DEPEND="
+	${RDEPEND}
+	dev-cpp/eigen
+	dev-cpp/nlohmann_json
+	<dev-libs/pegtl-3
+	dev-libs/utfcpp
+	test? (
+		media-libs/glew
+		x11-libs/libXcursor
+		rendering? ( media-libs/freeglut )
+	)
+"
+BDEPEND="virtual/pkgconfig"
+
+PATCHES=(
+	"${FILESDIR}"/${PN}-9.2.2-vtkGeometryFilter-add-missing-mutex-header-file.patch
+	"${FILESDIR}"/${PN}-9.2.2-VTKm-respect-user-CXXFLAGS.patch
+	"${FILESDIR}"/${PN}-9.2.2-link-with-glut-library-for-freeglut.patch
+	"${FILESDIR}"/${PN}-9.2.5-Add-include-cstdint-to-compile-with-gcc-13.patch
+	"${FILESDIR}"/${PN}-9.2.5-Fix-compilation-error-with-CUDA-12.patch
+	"${FILESDIR}"/${PN}-9.2.5-More-include-cstdint-to-compile-with-gcc13.patch
+)
+
+DOCS=( CONTRIBUTING.md README.md )
+
+vtk_check_reqs() {
+	local dsk=4096
+	local mem=$(( $(usex cuda 7168 0) ))
+
+	dsk=$(( $(usex doc 3072 0) + ${dsk} ))
+	dsk=$(( $(usex examples 3072 0) + ${dsk} ))
+	dsk=$(( $(usex cuda 8192 0) + ${dsk} ))
+
+	# In case users are not aware of the extra NINJAOPTS, check
+	# for the more common MAKEOPTS, in case NINJAOPTS is empty
+	local jobs=1
+	if [[ -n "${NINJAOPTS}" ]]; then
+		jobs=$(makeopts_jobs "${NINJAOPTS}" "$(get_nproc)")
+	else
+		if [[ -n "${MAKEOPTS}" ]]; then
+			jobs=$(makeopts_jobs "${MAKEOPTS}" "$(get_nproc)")
+		fi
+	fi
+	mem=$(( ${mem} * $(( ${jobs} > 4 ? 4 : ${jobs} )) ))
+
+	use cuda && export CHECKREQS_MEMORY=${mem}M
+	export CHECKREQS_DISK_BUILD=${dsk}M
+
+	check-reqs_pkg_${EBUILD_PHASE}
+}
+
+pkg_pretend() {
+	[[ ${MERGE_TYPE} != binary ]] && has openmp && tc-check-openmp
+
+	if [[ $(tc-is-gcc) && $(gcc-majorversion) = 11 ]] && use cuda ; then
+		# FIXME: better use eerror?
+		ewarn "GCC 11 is know to fail building with CUDA support in some cases."
+		ewarn "See bug #820593"
+	fi
+
+	if use qt6 && use qt5; then
+		ewarn "Both qt5 and qt6 USE flags have been selected. Using qt5!"
+	fi
+
+	# bug #835659
+	if use cuda; then
+		if [[ ${VTK_CUDA_ARCH} = native ]]; then
+			eerror "Using native CUDA arches is currently broken."
+			eerror "Please set it to one of the common arch names:"
+			eerror "kepler, maxwell, pascal, turing or ampere."
+			die "Please set VTK_CUDA_ARCH environment variable!"
+		fi
+	fi
+
+	vtk_check_reqs
+}
+
+pkg_setup() {
+	[[ ${MERGE_TYPE} != binary ]] && has openmp && tc-check-openmp
+
+	if [[ $(tc-is-gcc) && $(gcc-majorversion) = 11 ]] && use cuda ; then
+		# FIXME: better use eerror?
+		ewarn "GCC 11 is know to fail building with CUDA support in some cases."
+		ewarn "See bug #820593"
+	fi
+
+	if use qt6 && use qt5; then
+		ewarn "Both qt5 and qt6 USE flags have been selected. Using qt5!"
+	fi
+
+	# bug #835659
+	if use cuda; then
+		if [[ ${VTK_CUDA_ARCH} = native ]]; then
+			eerror "Using native CUDA arches is currently broken."
+			eerror "Please set it to one of the common arch names:"
+			eerror "kepler, maxwell, pascal, turing or ampere."
+			die "Please set VTK_CUDA_ARCH environment variable!"
+		fi
+	fi
+
+	vtk_check_reqs
+
+	use java && java-pkg-opt-2_pkg_setup
+	use python && python-single-r1_pkg_setup
+	use web && webapp_pkg_setup
+}
+
+# Note: The following libraries are marked as internal by kitware
+#	and can currently not unbundled:
+#	diy2, exodusII, fides, h5part, kissfft, loguru, verdict, vpic,
+#	vtkm, xdmf{2,3}, zfp
+# TODO: cli11 (::guru), exprtk, ioss
+# Note: As of v9.2.2 we no longer drop bundled libraries, when using system
+# libraries. This just saves a little space. CMake logic of VTK on ThirdParty
+# libraries avoids automagic builds, so deletion is not needed to catch these.
+src_prepare() {
+	if use doc; then
+		einfo "Removing .md5 files from documents."
+		rm -f "${WORKDIR}"/html/*.md5 || die "Failed to remove superfluous hashes"
+		sed -e "s|\${VTK_BINARY_DIR}/Utilities/Doxygen/doc|${WORKDIR}|" \
+			-i Utilities/Doxygen/CMakeLists.txt || die
+	fi
+
+	cmake_src_prepare
+
+	if use cuda; then
+		cuda_add_sandbox -w
+		cuda_src_prepare
+	fi
+
+	if use test; then
+		ebegin "Copying data files to ${BUILD_DIR}"
+		mkdir -p "${BUILD_DIR}/ExternalData" || die
+		pushd "${BUILD_DIR}/ExternalData" >/dev/null || die
+		ln -sf ../../VTK-${PV}/.ExternalData/README.rst . || die
+		ln -sf ../../VTK-${PV}/.ExternalData/SHA512 . || die
+		popd >/dev/null || die
+		eend "$?"
+	fi
+}
+
+# TODO: check these and consider to use them
+#	VTK_BUILD_SCALED_SOA_ARRAYS
+#	VTK_DISPATCH_{AOS,SOA,TYPED}_ARRAYS
+src_configure() {
+	local mycmakeargs=(
+		-DCMAKE_INSTALL_LICENSEDIR="share/${PN}/licenses"
+
+		-DVTK_ANDROID_BUILD=OFF
+		-DVTK_IOS_BUILD=OFF
+
+		-DVTK_BUILD_ALL_MODULES=$(usex all-modules ON OFF)
+		# we use the pre-built documentation and install these with USE=doc
+		-DVTK_BUILD_DOCUMENTATION=OFF
+		-DVTK_BUILD_EXAMPLES=$(usex examples ON OFF)
+
+		# no package in the tree: https://github.com/LLNL/conduit
+		-DVTK_ENABLE_CATALYST=OFF
+		-DVTK_ENABLE_KITS=OFF
+		-DVTK_ENABLE_LOGGING=$(usex logging ON OFF)
+		# defaults to ON: USE flag for this?
+		-DVTK_ENABLE_REMOTE_MODULES=OFF
+
+		# disable fetching files during build
+		-DVTK_FORBID_DOWNLOADS=ON
+
+		-DVTK_GROUP_ENABLE_Imaging=$(usex imaging "YES" "DEFAULT")
+		-DVTK_GROUP_ENABLE_Rendering=$(usex rendering "YES" "DEFAULT")
+		-DVTK_GROUP_ENABLE_StandAlone="YES"
+		-DVTK_GROUP_ENABLE_Views=$(usex views "YES" "DEFAULT")
+		-DVTK_GROUP_ENABLE_Web=$(usex web "YES" "DEFAULT")
+
+		-DVTK_INSTALL_SDK=ON
+
+		-DVTK_MODULE_ENABLE_VTK_IOCGNSReader="WANT"
+		-DVTK_MODULE_ENABLE_VTK_IOExportPDF="WANT"
+		-DVTK_MODULE_ENABLE_VTK_IOLAS=$(usex las "WANT" "DEFAULT")
+		-DVTK_MODULE_ENABLE_VTK_IONetCDF="WANT"
+		-DVTK_MODULE_ENABLE_VTK_IOOggTheora="WANT"
+		-DVTK_MODULE_ENABLE_VTK_IOOpenVDB=$(usex openvdb "WANT" "DEFAULT")
+		-DVTK_MODULE_ENABLE_VTK_IOSQL="WANT" # sqlite
+		-DVTK_MODULE_ENABLE_VTK_IOPDAL=$(usex pdal "WANT" "DEFAULT")
+		-DVTK_MODULE_ENABLE_VTK_IOXML="WANT"
+		-DVTK_MODULE_ENABLE_VTK_IOXMLParser="WANT"
+		-DVTK_MODULE_ENABLE_VTK_RenderingFreeType=$(usex freetype "WANT" "DEFAULT")
+		-DVTK_MODULE_ENABLE_VTK_RenderingFreeTypeFontConfig=$(usex freetype "WANT" "DEFAULT")
+		-DVTK_MODULE_ENABLE_VTK_cgns="WANT"
+		-DVTK_MODULE_ENABLE_VTK_doubleconversion="WANT"
+		-DVTK_MODULE_ENABLE_VTK_eigen="WANT"
+		-DVTK_MODULE_ENABLE_VTK_expat="WANT"
+		-DVTK_MODULE_ENABLE_VTK_fmt="WANT"
+		-DVTK_MODULE_ENABLE_VTK_freetype="WANT"
+		-DVTK_MODULE_ENABLE_VTK_hdf5="WANT"
+		-DVTK_MODULE_ENABLE_VTK_jpeg="WANT"
+		-DVTK_MODULE_ENABLE_VTK_jsoncpp="WANT"
+		-DVTK_MODULE_ENABLE_VTK_libharu="WANT"
+		-DVTK_MODULE_ENABLE_VTK_libproj="WANT"
+		-DVTK_MODULE_ENABLE_VTK_libxml2="WANT"
+		-DVTK_MODULE_ENABLE_VTK_lz4="WANT"
+		-DVTK_MODULE_ENABLE_VTK_lzma="WANT"
+		-DVTK_MODULE_ENABLE_VTK_netcdf="WANT"
+		-DVTK_MODULE_ENABLE_VTK_nlohmannjson="WANT"
+		-DVTK_MODULE_ENABLE_VTK_ogg="WANT"
+		-DVTK_MODULE_ENABLE_VTK_pegtl="WANT"
+		-DVTK_MODULE_ENABLE_VTK_png="WANT"
+		-DVTK_MODULE_ENABLE_VTK_pugixml="WANT"
+		-DVTK_MODULE_ENABLE_VTK_sqlite="WANT"
+		-DVTK_MODULE_ENABLE_VTK_theora="WANT"
+		-DVTK_MODULE_ENABLE_VTK_tiff="WANT"
+		-DVTK_MODULE_ENABLE_VTK_utf8="WANT"
+		-DVTK_MODULE_ENABLE_VTK_vtkm=$(usex vtkm "WANT" "DEFAULT")
+		-DVTK_MODULE_ENABLE_VTK_zlib="WANT"
+
+		# not packaged in Gentoo
+		-DVTK_MODULE_USE_EXTERNAL_VTK_exprtk=OFF
+		-DVTK_MODULE_USE_EXTERNAL_VTK_ioss=OFF
+		-DVTK_MODULE_USE_EXTERNAL_VTK_verdict=OFF
+
+		-DVTK_RELOCATABLE_INSTALL=ON
+
+		-DVTK_SMP_ENABLE_OPENMP=$(usex openmp ON OFF)
+		-DVTK_SMP_ENABLE_STDTHREAD=$(usex threads ON OFF)
+		-DVTK_SMP_ENABLE_TBB=$(usex tbb ON OFF)
+
+		-DVTK_UNIFIED_INSTALL_TREE=ON
+
+		-DVTK_USE_CUDA=$(usex cuda ON OFF)
+		# use system libraries where possible
+		-DVTK_USE_EXTERNAL=ON
+		# avoid finding package from either ::guru or ::sci
+		-DVTK_USE_MEMKIND=OFF
+		-DVTK_USE_MPI=$(usex mpi ON OFF)
+		-DVTK_USE_TK=$(usex tk ON OFF)
+		-DVTK_USE_X=ON
+
+		-DVTK_WHEEL_BUILD=OFF
+
+		-DVTK_WRAP_JAVA=$(usex java ON OFF)
+		-DVTK_WRAP_PYTHON=$(usex python ON OFF)
+	)
+
+	if use all-modules; then
+		mycmakeargs+=(
+			# no package in ::gentoo
+			-DVTK_ENABLE_OSPRAY=OFF
+			# TODO: some of these are tied to the VTK_ENABLE_REMOTE_MODULES
+			# option. Check whether we can download them clean and enable
+			# them.
+			-DVTK_MODULE_ENABLE_VTK_DomainsMicroscopy="NO"
+			-DVTK_MODULE_ENABLE_VTK_fides="NO"
+			-DVTK_MODULE_ENABLE_VTK_FiltersOpenTURNS="NO"
+			-DVTK_MODULE_ENABLE_VTK_IOADIOS2="NO"
+			-DVTK_MODULE_ENABLE_VTK_IOFides="NO"
+
+			-DVTK_MODULE_ENABLE_VTK_RenderingOpenVR="NO"
+			-DVTK_MODULE_ENABLE_VTK_RenderingOpenXR="NO"
+
+			# available in ::guru, so avoid  detection if installed
+			-DVTK_MODULE_USE_EXTERNAL_VTK_cli11=OFF
+		)
+	fi
+
+	if use boost; then
+		mycmakeargs+=(
+			-DVTK_MODULE_ENABLE_VTK_InfovisBoost="WANT"
+			-DVTK_MODULE_ENABLE_VTK_InfovisBoostGraphAlgorithms="WANT"
+		)
+	fi
+
+	# TODO: checks this on updates of nvidia-cuda-toolkit and update
+	# the list of available arches if necessary, i.e. add new arches
+	# once they are released at the end of the list before all.
+	# See https://en.wikipedia.org/wiki/CUDA#GPUs_supported
+	# CUDA 11.8 supports Ada Lovelace and Hopper arches, but cmake,
+	# as of 3.25.1 doesn't recognize these keywords.
+	# FIXME: better use numbers than names?
+	if use cuda; then
+		local cuda_arch=
+		case ${VTK_CUDA_ARCH:-native} in
+			# we ignore fermi arch, because current nvidia-cuda-toolkit-11*
+			# no longer supports it
+			kepler|maxwell|pascal|volta|turing|ampere|all)
+				cuda_arch=${VTK_CUDA_ARCH}
+				;;
+#			native)
+#				ewarn "If auto detection fails for you, please try and export the"
+#				ewarn "VTK_CUDA_ARCH environment variable to one of the common arch"
+#				ewarn "names: kepler, maxwell, pascal, volta, turing, ampere or all."
+#				cuda_arch=native
+#				;;
+			*)
+				eerror "Please properly set the VTK_CUDA_ARCH environment variable to"
+				eerror "one of: kepler, maxwell, pascal, volta, turing, ampere, all"
+				die "Invalid CUDA architecture given: '${VTK_CUDA_ARCH}'!"
+				;;
+		esac
+		ewarn "Using CUDA architecture '${cuda_arch}'"
+
+		mycmakeargs+=( -DVTKm_CUDA_Architecture=${cuda_arch} )
+	fi
+
+	if use debug; then
+		mycmakeargs+=(
+			-DVTK_DEBUG_LEAKS=ON
+			-DVTK_DEBUG_MODULE=ON
+			-DVTK_DEBUG_MODULE_ALL=ON
+			-DVTK_ENABLE_SANITIZER=ON
+			-DVTK_EXTRA_COMPILER_WARNINGS=ON
+			-DVTK_WARN_ON_DISPATCH_FAILURE=ON
+		)
+		if use rendering; then
+			mycmakeargs+=( -DVTK_OPENGL_ENABLE_STREAM_ANNOTATIONS=ON )
+		fi
+	fi
+
+	if use examples || use test; then
+		mycmakeargs+=( -DVTK_USE_LARGE_DATA=ON )
+	fi
+
+	if use ffmpeg; then
+		mycmakeargs+=( -DVTK_MODULE_ENABLE_VTK_IOFFMPEG="WANT" )
+		if use rendering; then
+			mycmakeargs+=( -DVTK_MODULE_ENABLE_VTK_RenderingFFMPEGOpenGL2="WANT" )
+		fi
+	fi
+
+	if use gdal; then
+		mycmakeargs+=(
+			-DVTK_MODULE_ENABLE_VTK_GeovisGDAL="WANT"
+			-DVTK_MODULE_ENABLE_VTK_IOGDAL="WANT"
+			-DVTK_MODULE_ENABLE_VTK_IOGeoJSON="WANT"
+		)
+	fi
+
+	if use imaging; then
+		mycmakeargs+=(
+			-DVTK_MODULE_ENABLE_VTK_ImagingColor="WANT"
+			-DVTK_MODULE_ENABLE_VTK_ImagingCore="WANT"
+			-DVTK_MODULE_ENABLE_VTK_ImagingFourier="WANT"
+			-DVTK_MODULE_ENABLE_VTK_ImagingGeneral="WANT"
+			-DVTK_MODULE_ENABLE_VTK_ImagingHybrid="WANT"
+			-DVTK_MODULE_ENABLE_VTK_ImagingMath="WANT"
+			-DVTK_MODULE_ENABLE_VTK_ImagingMorphological="WANT"
+			-DVTK_MODULE_ENABLE_VTK_ImagingOpenGL2="WANT"
+			-DVTK_MODULE_ENABLE_VTK_ImagingSources="WANT"
+			-DVTK_MODULE_ENABLE_VTK_ImagingStatistics="WANT"
+			-DVTK_MODULE_ENABLE_VTK_ImagingStencil="WANT"
+		)
+		use rendering && mycmakeargs+=( -DVTK_MODULE_ENABLE_VTK_RenderingImage="WANT" )
+	fi
+
+	if ! use java && ! use python; then
+		# defaults to ON
+		mycmakeargs+=( -DVTK_ENABLE_WRAPPING=OFF )
+	fi
+
+	if use java; then
+		mycmakeargs+=(
+			-DCMAKE_INSTALL_JARDIR="share/${PN}"
+			-DVTK_ENABLE_WRAPPING=ON
+			-DVTK_MODULE_ENABLE_VTK_Java="WANT"
+		)
+	fi
+
+	if use mpi; then
+		mycmakeargs+=(
+			-DVTK_GROUP_ENABLE_MPI="YES"
+			-DVTK_MODULE_ENABLE_VTK_IOH5part="WANT"
+			-DVTK_MODULE_ENABLE_VTK_IOMPIParallel="WANT"
+			-DVTK_MODULE_ENABLE_VTK_IOParallel="WANT"
+			-DVTK_MODULE_ENABLE_VTK_IOParallelNetCDF="WANT"
+			-DVTK_MODULE_ENABLE_VTK_IOParallelXML="WANT"
+			-DVTK_MODULE_ENABLE_VTK_ParallelMPI="WANT"
+			-DVTK_MODULE_ENABLE_VTK_h5part="WANT"
+			-DVTK_MODULE_USE_EXTERNAL_VTK_verdict=OFF
+		)
+		use imaging && mycmakeargs+=( -DVTK_MODULE_ENABLE_VTK_IOMPIImage="WANT" )
+		use python && mycmakeargs+=( -DVTK_MODULE_ENABLE_VTK_ParallelMPI4Py="WANT" )
+		if use rendering; then
+			mycmakeargs+=(
+				-DVTK_MODULE_ENABLE_VTK_RenderingParallel="WANT"
+				-DVTK_MODULE_ENABLE_VTK_RenderingParallelLIC="WANT"
+			)
+		fi
+		use vtkm && mycmakeargs+=( -DVTKm_ENABLE_MPI=ON )
+	else
+		mycmakeargs+=( -DVTK_GROUP_ENABLE_MPI="NO" )
+	fi
+
+	use mysql && mycmakeargs+=( -DVTK_MODULE_ENABLE_VTK_IOMySQL="WANT" )
+	use odbc && mycmakeargs+=( -DVTK_MODULE_ENABLE_VTK_IOODBC="WANT" )
+	use openvdb && mycmakeargs+=( -DOpenVDB_CMAKE_PATH="${ESYSROOT}/usr/$(get_libdir)/cmake/OpenVDB" )
+	use postgres && mycmakeargs+=( -DVTK_MODULE_ENABLE_VTK_IOPostgreSQL="WANT" )
+
+	if use python; then
+		mycmakeargs+=(
+			-DPython3_EXECUTABLE="${PYTHON}"
+			-DVTK_ENABLE_WRAPPING=ON
+			-DVTK_MODULE_ENABLE_VTK_Python="WANT"
+			-DVTK_MODULE_ENABLE_VTK_PythonInterpreter="WANT"
+			-DVTK_MODULE_ENABLE_VTK_WrappingPythonCore="WANT"
+			-DVTK_PYTHON_SITE_PACKAGES_SUFFIX="lib/${EPYTHON}/site-packages"
+		)
+		use rendering && mycmakeargs+=( -DVTK_MODULE_ENABLE_VTK_PythonContext2D="WANT" )
+	fi
+
+	if use qt5 && use qt6; then
+		# prefer Qt5: https://wiki.gentoo.org/wiki/Project:qt/Policies
+		mycmakeargs+=(
+			-DCMAKE_INSTALL_QMLDIR="${EPREFIX}/usr/$(get_libdir)/qt5/qml"
+			-DVTK_QT_VERSION="5"
+		)
+	else
+		if use qt5; then
+			mycmakeargs+=(
+				-DCMAKE_INSTALL_QMLDIR="${EPREFIX}/usr/$(get_libdir)/qt5/qml"
+				-DVTK_QT_VERSION="5"
+			)
+		elif use qt6; then
+			mycmakeargs+=(
+				-DCMAKE_INSTALL_QMLDIR="${EPFREIX}/usr/$(get_libdir)/qt6/qml"
+				-DVTK_QT_VERSION="6"
+			)
+		else
+			mycmakeargs+=( -DVTK_GROUP_ENABLE_Qt="NO" )
+		fi
+	fi
+
+	if use qt5 || use qt6; then
+		mycmakeargs+=(
+			-DVTK_GROUP_ENABLE_Qt:STRING="YES"
+			-DVTK_MODULE_ENABLE_VTK_GUISupportQt="WANT"
+			-DVTK_MODULE_ENABLE_VTK_GUISupportQtQuick="WANT"
+		)
+		if use mysql || use postgres; then
+			mycmakeargs+=( -DVTK_MODULE_ENABLE_VTK_GUISupportQtSQL="WANT" )
+		fi
+		if use rendering; then
+			mycmakeargs+=( -DVTK_MODULE_ENABLE_VTK_RenderingQt="WANT" )
+		fi
+		if use views; then
+			mycmakeargs+=( -DVTK_MODULE_ENABLE_VTK_ViewsQt="WANT" )
+		fi
+	fi
+
+	if use rendering; then
+		mycmakeargs+=(
+			-DVTK_ENABLE_OSPRAY=OFF
+
+			-DVTK_MODULE_ENABLE_VTK_IOExportGL2PS="WANT"
+			-DVTK_MODULE_ENABLE_VTK_RenderingAnnotation="WANT"
+			-DVTK_MODULE_ENABLE_VTK_RenderingContext2D="WANT"
+			-DVTK_MODULE_ENABLE_VTK_RenderingContextOpenGL2="WANT"
+			-DVTK_MODULE_ENABLE_VTK_RenderingCore="WANT"
+			-DVTK_MODULE_ENABLE_VTK_RenderingExternal="WANT"
+			-DVTK_MODULE_ENABLE_VTK_RenderingGL2PSOpenGL2="WANT"
+			-DVTK_MODULE_ENABLE_VTK_RenderingHyperTreeGrid="WANT"
+			-DVTK_MODULE_ENABLE_VTK_RenderingLICOpenGL2="WANT"
+			-DVTK_MODULE_ENABLE_VTK_RenderingLOD="WANT"
+			-DVTK_MODULE_ENABLE_VTK_RenderingLabel="WANT"
+			-DVTK_MODULE_ENABLE_VTK_RenderingMatplotlib="WANT"
+			-DVTK_MODULE_ENABLE_VTK_RenderingOpenGL2="WANT"
+			-DVTK_MODULE_ENABLE_VTK_RenderingRayTracing="WANT"
+			-DVTK_MODULE_ENABLE_VTK_RenderingSceneGraph="WANT"
+			-DVTK_MODULE_ENABLE_VTK_RenderingUI="WANT"
+			-DVTK_MODULE_ENABLE_VTK_RenderingVolume="WANT"
+			-DVTK_MODULE_ENABLE_VTK_RenderingVolumeAMR="WANT"
+			-DVTK_MODULE_ENABLE_VTK_RenderingVolumeOpenGL2="WANT"
+			-DVTK_MODULE_ENABLE_VTK_gl2ps="WANT"
+			-DVTK_MODULE_ENABLE_VTK_glew="WANT"
+			-DVTK_MODULE_ENABLE_VTK_opengl="WANT"
+
+			-DVTK_USE_SDL2=$(usex sdl "YES" "NO")
+		)
+		use tk && mycmakeargs+=( -DVTK_MODULE_ENABLE_VTK_RenderingTk="WANT" )
+		use views && mycmakeargs+=( -DVTK_MODULE_ENABLE_VTK_ViewsContext2D="WANT" )
+		use web && mycmakeargs+=( -DVTK_MODULE_ENABLE_VTK_RenderingVtkJS="WANT" )
+	fi
+
+	# Testing has been changed in 9.2.5: it is now allowed without
+	# requiring to download, if the data files are available locally!
+	if use test; then
+		mycmakeargs+=(
+			-DVTK_BUILD_TESTING=ON
+			# disable fetching data files for the default 'all' target
+			-DVTK_DATA_EXCLUDE_FROM_ALL=ON
+
+			# requested even if all use flags are off
+			-DVTK_MODULE_ENABLE_VTK_octree="WANT"
+			-DVTK_MODULE_ENABLE_VTK_ViewsCore="WANT"
+
+			# available in ::guru, so avoid  detection if installed
+			-DVTK_MODULE_USE_EXTERNAL_VTK_cli11=OFF
+		)
+	else
+		mycmakeargs+=( -DVTK_BUILD_TESTING=OFF )
+	fi
+
+	# FIXME: upstream provides 4 threading models, as of 9.1.0. These are
+	# sequential, stdthread, openmp and tbb. AFAICS all of them can be
+	# enabled at the same time. Sequential and Stdthread are enabled by
+	# default. The default selected type for the build is sequential.
+	# Assuming sequential < stdpthread < openmp < tbb wrt speed, although
+	# this is dependent on the actual scenario where threading is used.
+	if use tbb; then
+		mycmakeargs+=( -DVTK_SMP_IMPLEMENTATION_TYPE="TBB" )
+	elif use openmp; then
+		mycmakeargs+=( -DVTK_SMP_IMPLEMENTATION_TYPE="OpenMP" )
+	elif use threads; then
+		mycmakeargs+=( -DVTK_SMP_IMPLEMENTATION_TYPE="STDThread" )
+	else
+		mycmakeargs+=( -DVTK_SMP_IMPLEMENTATION_TYPE="Sequential" )
+	fi
+
+	use tk && mycmakeargs+=( -DVTK_GROUP_ENABLE_Tk="YES" )
+
+	if use views; then
+		mycmakeargs+=(
+			-DVTK_MODULE_ENABLE_VTK_ViewsCore="WANT"
+			-DVTK_MODULE_ENABLE_VTK_ViewsInfovis="WANT"
+		)
+	fi
+
+	if use vtkm; then
+		mycmakeargs+=(
+			-DVTK_MODULE_ENABLE_VTK_AcceleratorsVTKmCore="WANT"
+			-DVTK_MODULE_ENABLE_VTK_AcceleratorsVTKmDataModel="WANT"
+			-DVTK_MODULE_ENABLE_VTK_AcceleratorsVTKmFilters="WANT"
+
+			-DVTKm_NO_INSTALL_README_LICENSE=ON # bug #793221
+			-DVTKm_Vectorization=native
+		)
+	fi
+
+	if use web; then
+		mycmakeargs+=(
+			-DVTK_MODULE_ENABLE_VTK_WebCore="WANT"
+			-DVTK_MODULE_ENABLE_VTK_WebGLExporter="WANT"
+		)
+		use python && mycmakeargs+=( -DVTK_MODULE_ENABLE_VTK_WebPython="WANT" )
+	fi
+
+	use java && export JAVA_HOME="${EPREFIX}/etc/java-config-2/current-system-vm"
+
+	cmake_src_configure
+}
+
+src_compile() {
+	use test && cmake_build VTKData
+	cmake_src_compile
+}
+
+# FIXME: avoid nonfatal?
+# see https://github.com/gentoo/gentoo/pull/22878#discussion_r747204043
+src_test() {
+#	nonfatal virtx cmake_src_test
+	virtx cmake_src_test
+}
+
+src_install() {
+	use web && webapp_src_preinst
+
+	# Stop web page images from being compressed
+	if use doc; then
+		HTML_DOCS=( "${WORKDIR}/html/." )
+	fi
+
+	cmake_src_install
+
+	use java && java-pkg_regjar "${ED}"/usr/share/${PN}/${PN}.jar
+
+	# install examples
+	if use examples; then
+		einfo "Installing examples"
+		mv -v {E,e}xamples || die
+		dodoc -r examples
+		docompress -x /usr/share/doc/${PF}/examples
+
+		einfo "Installing datafiles"
+		insinto /usr/share/${PN}/data
+		doins -r "${S}/.ExternalData"
+	fi
+
+	use python && python_optimize
+
+	use web && webapp_src_install
+}
+
+# webapp.eclass exports these but we want it optional #534036
+pkg_postinst() {
+	use web && webapp_pkg_postinst
+
+	if use examples; then
+		einfo "You can get more and updated examples at"
+		einfo "https://kitware.github.io/vtk-examples/site/"
+	fi
+}
+
+pkg_prerm() {
+	use web && webapp_pkg_prerm
+}
diff --git a/sci-libs/vtk/vtk-9.2.6-r1.ebuild b/sci-libs/vtk/vtk-9.2.6-r1.ebuild
new file mode 100644
index 000000000000..bb87bdb1068e
--- /dev/null
+++ b/sci-libs/vtk/vtk-9.2.6-r1.ebuild
@@ -0,0 +1,747 @@
+# Copyright 1999-2023 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=8
+
+# TODO:
+# - add USE flag for remote modules? Those modules can be downloaded
+#	properly before building.
+# - replace usex by usev where applicable
+
+PYTHON_COMPAT=( python3_{9..11} )
+WEBAPP_OPTIONAL=yes
+WEBAPP_MANUAL_SLOT=yes
+
+inherit check-reqs cmake cuda java-pkg-opt-2 multiprocessing python-single-r1 toolchain-funcs virtualx webapp
+
+# Short package version
+MY_PV="$(ver_cut 1-2)"
+
+DESCRIPTION="The Visualization Toolkit"
+HOMEPAGE="https://www.vtk.org/"
+SRC_URI="
+	https://www.vtk.org/files/release/${MY_PV}/VTK-${PV}.tar.gz
+	https://www.vtk.org/files/release/${MY_PV}/VTKData-${PV}.tar.gz
+	https://www.vtk.org/files/release/${MY_PV}/VTKDataFiles-${PV}.tar.gz
+	doc? ( https://www.vtk.org/files/release/${MY_PV}/vtkDocHtml-${PV}.tar.gz )
+	examples? (
+		https://www.vtk.org/files/release/${MY_PV}/VTKLargeData-${PV}.tar.gz
+		https://www.vtk.org/files/release/${MY_PV}/VTKLargeDataFiles-${PV}.tar.gz
+	)
+	test? (
+		https://www.vtk.org/files/release/${MY_PV}/VTKLargeData-${PV}.tar.gz
+		https://www.vtk.org/files/release/${MY_PV}/VTKLargeDataFiles-${PV}.tar.gz
+	)
+"
+S="${WORKDIR}/VTK-${PV}"
+
+LICENSE="BSD LGPL-2"
+SLOT="0/${MY_PV}"
+KEYWORDS="~amd64 ~arm ~arm64 ~x86 ~amd64-linux ~x86-linux"
+# TODO: Like to simplifiy these. Mostly the flags related to Groups.
+IUSE="all-modules boost cuda debug doc examples ffmpeg freetype gdal imaging
+	java las +logging mpi mysql odbc openmp openvdb pdal postgres python qt5
+	qt6 +rendering sdl tbb test +threads tk video_cards_nvidia views vtkm web"
+
+RESTRICT="!test? ( test )"
+
+REQUIRED_USE="
+	all-modules? (
+		boost ffmpeg freetype gdal imaging las mysql odbc openvdb pdal
+		postgres rendering views
+	)
+	cuda? ( video_cards_nvidia vtkm )
+	java? ( rendering )
+	python? ( ${PYTHON_REQUIRED_USE} )
+	qt5? ( rendering )
+	qt6? ( rendering )
+	sdl? ( rendering )
+	tk? ( python rendering )
+	web? ( python )
+"
+
+# for <pegtl-3 dependency see
+# https://discourse.vtk.org/t/compilation-errors-related-to-pegtl-proj/5929
+# eigen, nlohmann_json, pegtl and utfcpp are referenced in the cmake files
+# and need to be available when VTK consumers configure the dependencies.
+RDEPEND="
+	app-arch/lz4:=
+	app-arch/xz-utils
+	dev-cpp/eigen
+	dev-cpp/nlohmann_json
+	dev-db/sqlite:3
+	dev-libs/double-conversion:=
+	dev-libs/expat
+	dev-libs/icu:=
+	dev-libs/jsoncpp:=
+	>=dev-libs/libfmt-8.1.1:=
+	dev-libs/libxml2:2
+	dev-libs/libzip:=
+	<dev-libs/pegtl-3
+	dev-libs/pugixml
+	dev-libs/utfcpp
+	media-libs/freetype
+	media-libs/libjpeg-turbo
+	>=media-libs/libharu-2.4.2:=
+	media-libs/libogg
+	media-libs/libpng:=
+	media-libs/libtheora
+	media-libs/tiff:=
+	>=sci-libs/cgnslib-4.1.1:=[hdf5,mpi=]
+	sci-libs/hdf5:=[mpi=]
+	sci-libs/proj:=
+	sci-libs/netcdf:=[mpi=]
+	sys-libs/zlib
+	boost? ( dev-libs/boost:=[mpi?] )
+	cuda? ( dev-util/nvidia-cuda-toolkit:= )
+	ffmpeg? ( media-video/ffmpeg:= )
+	freetype? ( media-libs/fontconfig )
+	gdal? ( sci-libs/gdal:= )
+	java? ( >=virtual/jdk-1.8:* )
+	las? ( sci-geosciences/liblas )
+	mpi? ( virtual/mpi[cxx,romio] )
+	mysql? ( dev-db/mariadb-connector-c )
+	odbc? ( dev-db/unixODBC )
+	openvdb? ( media-gfx/openvdb:= )
+	pdal? ( <sci-libs/pdal-2.6.0:= )
+	postgres? ( dev-db/postgresql:= )
+	python? (
+		${PYTHON_DEPS}
+		$(python_gen_cond_dep 'mpi? ( dev-python/mpi4py[${PYTHON_USEDEP}] )')
+	)
+	qt5? (
+		dev-qt/qtcore:5
+		dev-qt/qtopengl:5
+		dev-qt/qtquickcontrols2:5
+		dev-qt/qtsql:5
+		dev-qt/qtwidgets:5
+	)
+	qt6? (
+		dev-qt/qtbase:6[gui,opengl,sql,widgets]
+		dev-qt/qtdeclarative:6[opengl]
+		dev-qt/qtshadertools:6
+		x11-libs/libxkbcommon
+	)
+	sdl? ( media-libs/libsdl2 )
+	rendering? (
+		media-libs/glew:=
+		virtual/opengl
+		x11-libs/gl2ps
+		x11-libs/libICE
+		x11-libs/libXcursor
+		x11-libs/libXext
+	)
+	tbb? ( dev-cpp/tbb:= )
+	tk? ( dev-lang/tk:= )
+	video_cards_nvidia? ( x11-drivers/nvidia-drivers[tools,static-libs] )
+	views? (
+		x11-libs/libICE
+		x11-libs/libXext
+	)
+	web? ( ${WEBAPP_DEPEND} )
+"
+
+# for <pegtl-3 dependency see
+# https://discourse.vtk.org/t/compilation-errors-related-to-pegtl-proj/5929
+DEPEND="
+	${RDEPEND}
+	dev-cpp/eigen
+	dev-cpp/nlohmann_json
+	<dev-libs/pegtl-3
+	dev-libs/utfcpp
+	test? (
+		media-libs/glew
+		x11-libs/libXcursor
+		rendering? ( media-libs/freeglut )
+	)
+"
+BDEPEND="virtual/pkgconfig"
+
+PATCHES=(
+	"${FILESDIR}"/${PN}-9.2.2-vtkGeometryFilter-add-missing-mutex-header-file.patch
+	"${FILESDIR}"/${PN}-9.2.2-VTKm-respect-user-CXXFLAGS.patch
+	"${FILESDIR}"/${PN}-9.2.2-link-with-glut-library-for-freeglut.patch
+	"${FILESDIR}"/${PN}-9.2.5-Add-include-cstdint-to-compile-with-gcc-13.patch
+	"${FILESDIR}"/${PN}-9.2.5-Fix-compilation-error-with-CUDA-12.patch
+	"${FILESDIR}"/${PN}-9.2.5-More-include-cstdint-to-compile-with-gcc13.patch
+	"${FILESDIR}"/vtk-9.2.6-Java21.patch
+)
+
+DOCS=( CONTRIBUTING.md README.md )
+
+vtk_check_reqs() {
+	local dsk=4096
+	local mem=$(( $(usex cuda 7168 0) ))
+
+	dsk=$(( $(usex doc 3072 0) + ${dsk} ))
+	dsk=$(( $(usex examples 3072 0) + ${dsk} ))
+	dsk=$(( $(usex cuda 8192 0) + ${dsk} ))
+
+	# In case users are not aware of the extra NINJAOPTS, check
+	# for the more common MAKEOPTS, in case NINJAOPTS is empty
+	local jobs=1
+	if [[ -n "${NINJAOPTS}" ]]; then
+		jobs=$(makeopts_jobs "${NINJAOPTS}" "$(get_nproc)")
+	else
+		if [[ -n "${MAKEOPTS}" ]]; then
+			jobs=$(makeopts_jobs "${MAKEOPTS}" "$(get_nproc)")
+		fi
+	fi
+	mem=$(( ${mem} * $(( ${jobs} > 4 ? 4 : ${jobs} )) ))
+
+	use cuda && export CHECKREQS_MEMORY=${mem}M
+	export CHECKREQS_DISK_BUILD=${dsk}M
+
+	check-reqs_pkg_${EBUILD_PHASE}
+}
+
+pkg_pretend() {
+	[[ ${MERGE_TYPE} != binary ]] && has openmp && tc-check-openmp
+
+	if [[ $(tc-is-gcc) && $(gcc-majorversion) = 11 ]] && use cuda ; then
+		# FIXME: better use eerror?
+		ewarn "GCC 11 is know to fail building with CUDA support in some cases."
+		ewarn "See bug #820593"
+	fi
+
+	if use qt6 && use qt5; then
+		ewarn "Both qt5 and qt6 USE flags have been selected. Using qt5!"
+	fi
+
+	# bug #835659
+	if use cuda; then
+		if [[ ${VTK_CUDA_ARCH} = native ]]; then
+			eerror "Using native CUDA arches is currently broken."
+			eerror "Please set it to one of the common arch names:"
+			eerror "kepler, maxwell, pascal, turing or ampere."
+			die "Please set VTK_CUDA_ARCH environment variable!"
+		fi
+	fi
+
+	vtk_check_reqs
+}
+
+pkg_setup() {
+	[[ ${MERGE_TYPE} != binary ]] && has openmp && tc-check-openmp
+
+	if [[ $(tc-is-gcc) && $(gcc-majorversion) = 11 ]] && use cuda ; then
+		# FIXME: better use eerror?
+		ewarn "GCC 11 is know to fail building with CUDA support in some cases."
+		ewarn "See bug #820593"
+	fi
+
+	if use qt6 && use qt5; then
+		ewarn "Both qt5 and qt6 USE flags have been selected. Using qt5!"
+	fi
+
+	# bug #835659
+	if use cuda; then
+		if [[ ${VTK_CUDA_ARCH} = native ]]; then
+			eerror "Using native CUDA arches is currently broken."
+			eerror "Please set it to one of the common arch names:"
+			eerror "kepler, maxwell, pascal, turing or ampere."
+			die "Please set VTK_CUDA_ARCH environment variable!"
+		fi
+	fi
+
+	vtk_check_reqs
+
+	use java && java-pkg-opt-2_pkg_setup
+	use python && python-single-r1_pkg_setup
+	use web && webapp_pkg_setup
+}
+
+# Note: The following libraries are marked as internal by kitware
+#	and can currently not unbundled:
+#	diy2, exodusII, fides, h5part, kissfft, loguru, verdict, vpic,
+#	vtkm, xdmf{2,3}, zfp
+# TODO: cli11 (::guru), exprtk, ioss
+# Note: As of v9.2.2 we no longer drop bundled libraries, when using system
+# libraries. This just saves a little space. CMake logic of VTK on ThirdParty
+# libraries avoids automagic builds, so deletion is not needed to catch these.
+src_prepare() {
+	if use doc; then
+		einfo "Removing .md5 files from documents."
+		rm -f "${WORKDIR}"/html/*.md5 || die "Failed to remove superfluous hashes"
+		sed -e "s|\${VTK_BINARY_DIR}/Utilities/Doxygen/doc|${WORKDIR}|" \
+			-i Utilities/Doxygen/CMakeLists.txt || die
+	fi
+
+	cmake_src_prepare
+
+	if use cuda; then
+		cuda_add_sandbox -w
+		cuda_src_prepare
+	fi
+
+	if use test; then
+		ebegin "Copying data files to ${BUILD_DIR}"
+		mkdir -p "${BUILD_DIR}/ExternalData" || die
+		pushd "${BUILD_DIR}/ExternalData" >/dev/null || die
+		ln -sf ../../VTK-${PV}/.ExternalData/README.rst . || die
+		ln -sf ../../VTK-${PV}/.ExternalData/SHA512 . || die
+		popd >/dev/null || die
+		eend "$?"
+	fi
+}
+
+# TODO: check these and consider to use them
+#	VTK_BUILD_SCALED_SOA_ARRAYS
+#	VTK_DISPATCH_{AOS,SOA,TYPED}_ARRAYS
+src_configure() {
+	local mycmakeargs=(
+		-DCMAKE_INSTALL_LICENSEDIR="share/${PN}/licenses"
+
+		-DVTK_ANDROID_BUILD=OFF
+		-DVTK_IOS_BUILD=OFF
+
+		-DVTK_BUILD_ALL_MODULES=$(usex all-modules ON OFF)
+		# we use the pre-built documentation and install these with USE=doc
+		-DVTK_BUILD_DOCUMENTATION=OFF
+		-DVTK_BUILD_EXAMPLES=$(usex examples ON OFF)
+
+		# no package in the tree: https://github.com/LLNL/conduit
+		-DVTK_ENABLE_CATALYST=OFF
+		-DVTK_ENABLE_KITS=OFF
+		-DVTK_ENABLE_LOGGING=$(usex logging ON OFF)
+		# defaults to ON: USE flag for this?
+		-DVTK_ENABLE_REMOTE_MODULES=OFF
+
+		# disable fetching files during build
+		-DVTK_FORBID_DOWNLOADS=ON
+
+		-DVTK_GROUP_ENABLE_Imaging=$(usex imaging "YES" "DEFAULT")
+		-DVTK_GROUP_ENABLE_Rendering=$(usex rendering "YES" "DEFAULT")
+		-DVTK_GROUP_ENABLE_StandAlone="YES"
+		-DVTK_GROUP_ENABLE_Views=$(usex views "YES" "DEFAULT")
+		-DVTK_GROUP_ENABLE_Web=$(usex web "YES" "DEFAULT")
+
+		-DVTK_INSTALL_SDK=ON
+
+		-DVTK_MODULE_ENABLE_VTK_IOCGNSReader="WANT"
+		-DVTK_MODULE_ENABLE_VTK_IOExportPDF="WANT"
+		-DVTK_MODULE_ENABLE_VTK_IOLAS=$(usex las "WANT" "DEFAULT")
+		-DVTK_MODULE_ENABLE_VTK_IONetCDF="WANT"
+		-DVTK_MODULE_ENABLE_VTK_IOOggTheora="WANT"
+		-DVTK_MODULE_ENABLE_VTK_IOOpenVDB=$(usex openvdb "WANT" "DEFAULT")
+		-DVTK_MODULE_ENABLE_VTK_IOSQL="WANT" # sqlite
+		-DVTK_MODULE_ENABLE_VTK_IOPDAL=$(usex pdal "WANT" "DEFAULT")
+		-DVTK_MODULE_ENABLE_VTK_IOXML="WANT"
+		-DVTK_MODULE_ENABLE_VTK_IOXMLParser="WANT"
+		-DVTK_MODULE_ENABLE_VTK_RenderingFreeType=$(usex freetype "WANT" "DEFAULT")
+		-DVTK_MODULE_ENABLE_VTK_RenderingFreeTypeFontConfig=$(usex freetype "WANT" "DEFAULT")
+		-DVTK_MODULE_ENABLE_VTK_cgns="WANT"
+		-DVTK_MODULE_ENABLE_VTK_doubleconversion="WANT"
+		-DVTK_MODULE_ENABLE_VTK_eigen="WANT"
+		-DVTK_MODULE_ENABLE_VTK_expat="WANT"
+		-DVTK_MODULE_ENABLE_VTK_fmt="WANT"
+		-DVTK_MODULE_ENABLE_VTK_freetype="WANT"
+		-DVTK_MODULE_ENABLE_VTK_hdf5="WANT"
+		-DVTK_MODULE_ENABLE_VTK_jpeg="WANT"
+		-DVTK_MODULE_ENABLE_VTK_jsoncpp="WANT"
+		-DVTK_MODULE_ENABLE_VTK_libharu="WANT"
+		-DVTK_MODULE_ENABLE_VTK_libproj="WANT"
+		-DVTK_MODULE_ENABLE_VTK_libxml2="WANT"
+		-DVTK_MODULE_ENABLE_VTK_lz4="WANT"
+		-DVTK_MODULE_ENABLE_VTK_lzma="WANT"
+		-DVTK_MODULE_ENABLE_VTK_netcdf="WANT"
+		-DVTK_MODULE_ENABLE_VTK_nlohmannjson="WANT"
+		-DVTK_MODULE_ENABLE_VTK_ogg="WANT"
+		-DVTK_MODULE_ENABLE_VTK_pegtl="WANT"
+		-DVTK_MODULE_ENABLE_VTK_png="WANT"
+		-DVTK_MODULE_ENABLE_VTK_pugixml="WANT"
+		-DVTK_MODULE_ENABLE_VTK_sqlite="WANT"
+		-DVTK_MODULE_ENABLE_VTK_theora="WANT"
+		-DVTK_MODULE_ENABLE_VTK_tiff="WANT"
+		-DVTK_MODULE_ENABLE_VTK_utf8="WANT"
+		-DVTK_MODULE_ENABLE_VTK_vtkm=$(usex vtkm "WANT" "DEFAULT")
+		-DVTK_MODULE_ENABLE_VTK_zlib="WANT"
+
+		# not packaged in Gentoo
+		-DVTK_MODULE_USE_EXTERNAL_VTK_exprtk=OFF
+		-DVTK_MODULE_USE_EXTERNAL_VTK_ioss=OFF
+		-DVTK_MODULE_USE_EXTERNAL_VTK_verdict=OFF
+
+		-DVTK_RELOCATABLE_INSTALL=ON
+
+		-DVTK_SMP_ENABLE_OPENMP=$(usex openmp ON OFF)
+		-DVTK_SMP_ENABLE_STDTHREAD=$(usex threads ON OFF)
+		-DVTK_SMP_ENABLE_TBB=$(usex tbb ON OFF)
+
+		-DVTK_UNIFIED_INSTALL_TREE=ON
+
+		-DVTK_USE_CUDA=$(usex cuda ON OFF)
+		# use system libraries where possible
+		-DVTK_USE_EXTERNAL=ON
+		# avoid finding package from either ::guru or ::sci
+		-DVTK_USE_MEMKIND=OFF
+		-DVTK_USE_MPI=$(usex mpi ON OFF)
+		-DVTK_USE_TK=$(usex tk ON OFF)
+		-DVTK_USE_X=ON
+
+		-DVTK_WHEEL_BUILD=OFF
+
+		-DVTK_WRAP_JAVA=$(usex java ON OFF)
+		-DVTK_WRAP_PYTHON=$(usex python ON OFF)
+	)
+
+	if use all-modules; then
+		mycmakeargs+=(
+			# no package in ::gentoo
+			-DVTK_ENABLE_OSPRAY=OFF
+			# TODO: some of these are tied to the VTK_ENABLE_REMOTE_MODULES
+			# option. Check whether we can download them clean and enable
+			# them.
+			-DVTK_MODULE_ENABLE_VTK_DomainsMicroscopy="NO"
+			-DVTK_MODULE_ENABLE_VTK_fides="NO"
+			-DVTK_MODULE_ENABLE_VTK_FiltersOpenTURNS="NO"
+			-DVTK_MODULE_ENABLE_VTK_IOADIOS2="NO"
+			-DVTK_MODULE_ENABLE_VTK_IOFides="NO"
+
+			-DVTK_MODULE_ENABLE_VTK_RenderingOpenVR="NO"
+			-DVTK_MODULE_ENABLE_VTK_RenderingOpenXR="NO"
+
+			# available in ::guru, so avoid  detection if installed
+			-DVTK_MODULE_USE_EXTERNAL_VTK_cli11=OFF
+		)
+	fi
+
+	if use boost; then
+		mycmakeargs+=(
+			-DVTK_MODULE_ENABLE_VTK_InfovisBoost="WANT"
+			-DVTK_MODULE_ENABLE_VTK_InfovisBoostGraphAlgorithms="WANT"
+		)
+	fi
+
+	# TODO: checks this on updates of nvidia-cuda-toolkit and update
+	# the list of available arches if necessary, i.e. add new arches
+	# once they are released at the end of the list before all.
+	# See https://en.wikipedia.org/wiki/CUDA#GPUs_supported
+	# CUDA 11.8 supports Ada Lovelace and Hopper arches, but cmake,
+	# as of 3.25.1 doesn't recognize these keywords.
+	# FIXME: better use numbers than names?
+	if use cuda; then
+		local cuda_arch=
+		case ${VTK_CUDA_ARCH:-native} in
+			# we ignore fermi arch, because current nvidia-cuda-toolkit-11*
+			# no longer supports it
+			kepler|maxwell|pascal|volta|turing|ampere|all)
+				cuda_arch=${VTK_CUDA_ARCH}
+				;;
+#			native)
+#				ewarn "If auto detection fails for you, please try and export the"
+#				ewarn "VTK_CUDA_ARCH environment variable to one of the common arch"
+#				ewarn "names: kepler, maxwell, pascal, volta, turing, ampere or all."
+#				cuda_arch=native
+#				;;
+			*)
+				eerror "Please properly set the VTK_CUDA_ARCH environment variable to"
+				eerror "one of: kepler, maxwell, pascal, volta, turing, ampere, all"
+				die "Invalid CUDA architecture given: '${VTK_CUDA_ARCH}'!"
+				;;
+		esac
+		ewarn "Using CUDA architecture '${cuda_arch}'"
+
+		mycmakeargs+=( -DVTKm_CUDA_Architecture=${cuda_arch} )
+	fi
+
+	if use debug; then
+		mycmakeargs+=(
+			-DVTK_DEBUG_LEAKS=ON
+			-DVTK_DEBUG_MODULE=ON
+			-DVTK_DEBUG_MODULE_ALL=ON
+			-DVTK_ENABLE_SANITIZER=ON
+			-DVTK_EXTRA_COMPILER_WARNINGS=ON
+			-DVTK_WARN_ON_DISPATCH_FAILURE=ON
+		)
+		if use rendering; then
+			mycmakeargs+=( -DVTK_OPENGL_ENABLE_STREAM_ANNOTATIONS=ON )
+		fi
+	fi
+
+	if use examples || use test; then
+		mycmakeargs+=( -DVTK_USE_LARGE_DATA=ON )
+	fi
+
+	if use ffmpeg; then
+		mycmakeargs+=( -DVTK_MODULE_ENABLE_VTK_IOFFMPEG="WANT" )
+		if use rendering; then
+			mycmakeargs+=( -DVTK_MODULE_ENABLE_VTK_RenderingFFMPEGOpenGL2="WANT" )
+		fi
+	fi
+
+	if use gdal; then
+		mycmakeargs+=(
+			-DVTK_MODULE_ENABLE_VTK_GeovisGDAL="WANT"
+			-DVTK_MODULE_ENABLE_VTK_IOGDAL="WANT"
+			-DVTK_MODULE_ENABLE_VTK_IOGeoJSON="WANT"
+		)
+	fi
+
+	if use imaging; then
+		mycmakeargs+=(
+			-DVTK_MODULE_ENABLE_VTK_ImagingColor="WANT"
+			-DVTK_MODULE_ENABLE_VTK_ImagingCore="WANT"
+			-DVTK_MODULE_ENABLE_VTK_ImagingFourier="WANT"
+			-DVTK_MODULE_ENABLE_VTK_ImagingGeneral="WANT"
+			-DVTK_MODULE_ENABLE_VTK_ImagingHybrid="WANT"
+			-DVTK_MODULE_ENABLE_VTK_ImagingMath="WANT"
+			-DVTK_MODULE_ENABLE_VTK_ImagingMorphological="WANT"
+			-DVTK_MODULE_ENABLE_VTK_ImagingOpenGL2="WANT"
+			-DVTK_MODULE_ENABLE_VTK_ImagingSources="WANT"
+			-DVTK_MODULE_ENABLE_VTK_ImagingStatistics="WANT"
+			-DVTK_MODULE_ENABLE_VTK_ImagingStencil="WANT"
+		)
+		use rendering && mycmakeargs+=( -DVTK_MODULE_ENABLE_VTK_RenderingImage="WANT" )
+	fi
+
+	if ! use java && ! use python; then
+		# defaults to ON
+		mycmakeargs+=( -DVTK_ENABLE_WRAPPING=OFF )
+	fi
+
+	if use java; then
+		mycmakeargs+=(
+			-DCMAKE_INSTALL_JARDIR="share/${PN}"
+			-DVTK_ENABLE_WRAPPING=ON
+			-DVTK_MODULE_ENABLE_VTK_Java="WANT"
+		)
+	fi
+
+	if use mpi; then
+		mycmakeargs+=(
+			-DVTK_GROUP_ENABLE_MPI="YES"
+			-DVTK_MODULE_ENABLE_VTK_IOH5part="WANT"
+			-DVTK_MODULE_ENABLE_VTK_IOMPIParallel="WANT"
+			-DVTK_MODULE_ENABLE_VTK_IOParallel="WANT"
+			-DVTK_MODULE_ENABLE_VTK_IOParallelNetCDF="WANT"
+			-DVTK_MODULE_ENABLE_VTK_IOParallelXML="WANT"
+			-DVTK_MODULE_ENABLE_VTK_ParallelMPI="WANT"
+			-DVTK_MODULE_ENABLE_VTK_h5part="WANT"
+			-DVTK_MODULE_USE_EXTERNAL_VTK_verdict=OFF
+		)
+		use imaging && mycmakeargs+=( -DVTK_MODULE_ENABLE_VTK_IOMPIImage="WANT" )
+		use python && mycmakeargs+=( -DVTK_MODULE_ENABLE_VTK_ParallelMPI4Py="WANT" )
+		if use rendering; then
+			mycmakeargs+=(
+				-DVTK_MODULE_ENABLE_VTK_RenderingParallel="WANT"
+				-DVTK_MODULE_ENABLE_VTK_RenderingParallelLIC="WANT"
+			)
+		fi
+		use vtkm && mycmakeargs+=( -DVTKm_ENABLE_MPI=ON )
+	else
+		mycmakeargs+=( -DVTK_GROUP_ENABLE_MPI="NO" )
+	fi
+
+	use mysql && mycmakeargs+=( -DVTK_MODULE_ENABLE_VTK_IOMySQL="WANT" )
+	use odbc && mycmakeargs+=( -DVTK_MODULE_ENABLE_VTK_IOODBC="WANT" )
+	use openvdb && mycmakeargs+=( -DOpenVDB_CMAKE_PATH="${ESYSROOT}/usr/$(get_libdir)/cmake/OpenVDB" )
+	use postgres && mycmakeargs+=( -DVTK_MODULE_ENABLE_VTK_IOPostgreSQL="WANT" )
+
+	if use python; then
+		mycmakeargs+=(
+			-DPython3_EXECUTABLE="${PYTHON}"
+			-DVTK_ENABLE_WRAPPING=ON
+			-DVTK_MODULE_ENABLE_VTK_Python="WANT"
+			-DVTK_MODULE_ENABLE_VTK_PythonInterpreter="WANT"
+			-DVTK_MODULE_ENABLE_VTK_WrappingPythonCore="WANT"
+			-DVTK_PYTHON_SITE_PACKAGES_SUFFIX="lib/${EPYTHON}/site-packages"
+		)
+		use rendering && mycmakeargs+=( -DVTK_MODULE_ENABLE_VTK_PythonContext2D="WANT" )
+	fi
+
+	if use qt5 && use qt6; then
+		# prefer Qt5: https://wiki.gentoo.org/wiki/Project:qt/Policies
+		mycmakeargs+=(
+			-DCMAKE_INSTALL_QMLDIR="${EPREFIX}/usr/$(get_libdir)/qt5/qml"
+			-DVTK_QT_VERSION="5"
+		)
+	else
+		if use qt5; then
+			mycmakeargs+=(
+				-DCMAKE_INSTALL_QMLDIR="${EPREFIX}/usr/$(get_libdir)/qt5/qml"
+				-DVTK_QT_VERSION="5"
+			)
+		elif use qt6; then
+			mycmakeargs+=(
+				-DCMAKE_INSTALL_QMLDIR="${EPFREIX}/usr/$(get_libdir)/qt6/qml"
+				-DVTK_QT_VERSION="6"
+			)
+		else
+			mycmakeargs+=( -DVTK_GROUP_ENABLE_Qt="NO" )
+		fi
+	fi
+
+	if use qt5 || use qt6; then
+		mycmakeargs+=(
+			-DVTK_GROUP_ENABLE_Qt:STRING="YES"
+			-DVTK_MODULE_ENABLE_VTK_GUISupportQt="WANT"
+			-DVTK_MODULE_ENABLE_VTK_GUISupportQtQuick="WANT"
+		)
+		if use mysql || use postgres; then
+			mycmakeargs+=( -DVTK_MODULE_ENABLE_VTK_GUISupportQtSQL="WANT" )
+		fi
+		if use rendering; then
+			mycmakeargs+=( -DVTK_MODULE_ENABLE_VTK_RenderingQt="WANT" )
+		fi
+		if use views; then
+			mycmakeargs+=( -DVTK_MODULE_ENABLE_VTK_ViewsQt="WANT" )
+		fi
+	fi
+
+	if use rendering; then
+		mycmakeargs+=(
+			-DVTK_ENABLE_OSPRAY=OFF
+
+			-DVTK_MODULE_ENABLE_VTK_IOExportGL2PS="WANT"
+			-DVTK_MODULE_ENABLE_VTK_RenderingAnnotation="WANT"
+			-DVTK_MODULE_ENABLE_VTK_RenderingContext2D="WANT"
+			-DVTK_MODULE_ENABLE_VTK_RenderingContextOpenGL2="WANT"
+			-DVTK_MODULE_ENABLE_VTK_RenderingCore="WANT"
+			-DVTK_MODULE_ENABLE_VTK_RenderingExternal="WANT"
+			-DVTK_MODULE_ENABLE_VTK_RenderingGL2PSOpenGL2="WANT"
+			-DVTK_MODULE_ENABLE_VTK_RenderingHyperTreeGrid="WANT"
+			-DVTK_MODULE_ENABLE_VTK_RenderingLICOpenGL2="WANT"
+			-DVTK_MODULE_ENABLE_VTK_RenderingLOD="WANT"
+			-DVTK_MODULE_ENABLE_VTK_RenderingLabel="WANT"
+			-DVTK_MODULE_ENABLE_VTK_RenderingMatplotlib="WANT"
+			-DVTK_MODULE_ENABLE_VTK_RenderingOpenGL2="WANT"
+			-DVTK_MODULE_ENABLE_VTK_RenderingRayTracing="WANT"
+			-DVTK_MODULE_ENABLE_VTK_RenderingSceneGraph="WANT"
+			-DVTK_MODULE_ENABLE_VTK_RenderingUI="WANT"
+			-DVTK_MODULE_ENABLE_VTK_RenderingVolume="WANT"
+			-DVTK_MODULE_ENABLE_VTK_RenderingVolumeAMR="WANT"
+			-DVTK_MODULE_ENABLE_VTK_RenderingVolumeOpenGL2="WANT"
+			-DVTK_MODULE_ENABLE_VTK_gl2ps="WANT"
+			-DVTK_MODULE_ENABLE_VTK_glew="WANT"
+			-DVTK_MODULE_ENABLE_VTK_opengl="WANT"
+
+			-DVTK_USE_SDL2=$(usex sdl "YES" "NO")
+		)
+		use tk && mycmakeargs+=( -DVTK_MODULE_ENABLE_VTK_RenderingTk="WANT" )
+		use views && mycmakeargs+=( -DVTK_MODULE_ENABLE_VTK_ViewsContext2D="WANT" )
+		use web && mycmakeargs+=( -DVTK_MODULE_ENABLE_VTK_RenderingVtkJS="WANT" )
+	fi
+
+	# Testing has been changed in 9.2.5: it is now allowed without
+	# requiring to download, if the data files are available locally!
+	if use test; then
+		mycmakeargs+=(
+			-DVTK_BUILD_TESTING=ON
+			# disable fetching data files for the default 'all' target
+			-DVTK_DATA_EXCLUDE_FROM_ALL=ON
+
+			# requested even if all use flags are off
+			-DVTK_MODULE_ENABLE_VTK_octree="WANT"
+			-DVTK_MODULE_ENABLE_VTK_ViewsCore="WANT"
+
+			# available in ::guru, so avoid  detection if installed
+			-DVTK_MODULE_USE_EXTERNAL_VTK_cli11=OFF
+		)
+	else
+		mycmakeargs+=( -DVTK_BUILD_TESTING=OFF )
+	fi
+
+	# FIXME: upstream provides 4 threading models, as of 9.1.0. These are
+	# sequential, stdthread, openmp and tbb. AFAICS all of them can be
+	# enabled at the same time. Sequential and Stdthread are enabled by
+	# default. The default selected type for the build is sequential.
+	# Assuming sequential < stdpthread < openmp < tbb wrt speed, although
+	# this is dependent on the actual scenario where threading is used.
+	if use tbb; then
+		mycmakeargs+=( -DVTK_SMP_IMPLEMENTATION_TYPE="TBB" )
+	elif use openmp; then
+		mycmakeargs+=( -DVTK_SMP_IMPLEMENTATION_TYPE="OpenMP" )
+	elif use threads; then
+		mycmakeargs+=( -DVTK_SMP_IMPLEMENTATION_TYPE="STDThread" )
+	else
+		mycmakeargs+=( -DVTK_SMP_IMPLEMENTATION_TYPE="Sequential" )
+	fi
+
+	use tk && mycmakeargs+=( -DVTK_GROUP_ENABLE_Tk="YES" )
+
+	if use views; then
+		mycmakeargs+=(
+			-DVTK_MODULE_ENABLE_VTK_ViewsCore="WANT"
+			-DVTK_MODULE_ENABLE_VTK_ViewsInfovis="WANT"
+		)
+	fi
+
+	if use vtkm; then
+		mycmakeargs+=(
+			-DVTK_MODULE_ENABLE_VTK_AcceleratorsVTKmCore="WANT"
+			-DVTK_MODULE_ENABLE_VTK_AcceleratorsVTKmDataModel="WANT"
+			-DVTK_MODULE_ENABLE_VTK_AcceleratorsVTKmFilters="WANT"
+
+			-DVTKm_NO_INSTALL_README_LICENSE=ON # bug #793221
+			-DVTKm_Vectorization=native
+		)
+	fi
+
+	if use web; then
+		mycmakeargs+=(
+			-DVTK_MODULE_ENABLE_VTK_WebCore="WANT"
+			-DVTK_MODULE_ENABLE_VTK_WebGLExporter="WANT"
+		)
+		use python && mycmakeargs+=( -DVTK_MODULE_ENABLE_VTK_WebPython="WANT" )
+	fi
+
+	use java && export JAVA_HOME="${EPREFIX}/etc/java-config-2/current-system-vm"
+
+	cmake_src_configure
+}
+
+src_compile() {
+	use test && cmake_build VTKData
+	cmake_src_compile
+}
+
+# FIXME: avoid nonfatal?
+# see https://github.com/gentoo/gentoo/pull/22878#discussion_r747204043
+src_test() {
+#	nonfatal virtx cmake_src_test
+	virtx cmake_src_test
+}
+
+src_install() {
+	use web && webapp_src_preinst
+
+	# Stop web page images from being compressed
+	if use doc; then
+		HTML_DOCS=( "${WORKDIR}/html/." )
+	fi
+
+	cmake_src_install
+
+	use java && java-pkg_regjar "${ED}"/usr/share/${PN}/${PN}.jar
+
+	# install examples
+	if use examples; then
+		einfo "Installing examples"
+		mv -v {E,e}xamples || die
+		dodoc -r examples
+		docompress -x /usr/share/doc/${PF}/examples
+
+		einfo "Installing datafiles"
+		insinto /usr/share/${PN}/data
+		doins -r "${S}/.ExternalData"
+	fi
+
+	use python && python_optimize
+
+	use web && webapp_src_install
+}
+
+# webapp.eclass exports these but we want it optional #534036
+pkg_postinst() {
+	use web && webapp_pkg_postinst
+
+	if use examples; then
+		einfo "You can get more and updated examples at"
+		einfo "https://kitware.github.io/vtk-examples/site/"
+	fi
+}
+
+pkg_prerm() {
+	use web && webapp_pkg_prerm
+}