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diff --git a/sci-mathematics/yacas/yacas-1.9.1.ebuild b/sci-mathematics/yacas/yacas-1.9.1.ebuild
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+# Copyright 1999-2022 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=8
+
+# Sphinx doc building is not compatible with in-tree version of sphinx-bibtex:
+# Extension error: You must configure the bibtex_bibfiles setting
+#
+# PYTHON_COMPAT=( python3_{8..10} )
+# DOCS_BUILDER="sphinx"
+# DOCS_DEPEND="
+# 	dev-python/sphinxcontrib-bibtex
+# 	dev-python/sphinx_rtd_theme
+# "
+
+inherit cmake xdg # python-any-r1 docs
+
+DESCRIPTION="General purpose computer algebra system"
+HOMEPAGE="https://www.yacas.org/"
+SRC_URI="https://github.com/grzegorzmazur/${PN}/archive/refs/tags/v${PV}.tar.gz -> ${P}.tar.gz"
+
+LICENSE="GPL-2 gui? ( MIT Apache-2.0 OFL-1.1 )"
+SLOT="0/1"
+KEYWORDS="~amd64 ~x86"
+IUSE="gui +jupyter static-libs test"
+RESTRICT="!test? ( test )"
+
+DEPEND="
+	gui? (
+		dev-libs/mathjax
+		dev-qt/qtcore:5[icu]
+		dev-qt/qtgui:5
+		dev-qt/qtmultimedia:5
+		dev-qt/qtnetwork:5
+		dev-qt/qtopengl:5
+		dev-qt/qtprintsupport:5
+		dev-qt/qtsql:5
+		dev-qt/qtsvg:5
+		dev-qt/qtwebengine:5[widgets]
+		dev-qt/qtwidgets:5
+	)
+	jupyter? (
+		dev-libs/boost:=
+		dev-libs/jsoncpp:=
+		dev-libs/openssl:0=
+		dev-python/jupyter
+		net-libs/zeromq
+		>=net-libs/zmqpp-4.1.2
+	)
+"
+RDEPEND="${DEPEND}"
+
+src_prepare() {
+	# respect DESTDIR. avoid sandbox violation
+	sed -i -e 's/${CMAKE_INSTALL_PREFIX}/\\$ENV{DESTDIR}\/${CMAKE_INSTALL_PREFIX}/g' \
+		cyacas/yacas-gui/resources/CMakeLists.txt || die
+	cmake_src_prepare
+}
+
+src_configure() {
+	# TODO: Unbundle CodeMirror
+	local mycmakeargs=(
+		-DENABLE_CYACAS_BENCHMARKS=OFF
+		-DENABLE_DOCS=OFF
+		# -DENABLE_DOCS=$(usex doc)
+		-DENABLE_JYACAS=OFF # requires manual install
+		-DENABLE_CYACAS_GUI=$(usex gui)
+		# use system version of mathjax instead
+		-DENABLE_CYACAS_GUI_PRIVATE_MATHJAX=OFF
+		-DMATHJAX_PATH="${EPREFIX}/usr/share/mathjax/MathJax.js"
+		-DENABLE_CYACAS_KERNEL=$(usex jupyter)
+		-DENABLE_CYACAS_UNIT_TESTS=$(usex test)
+	)
+	cmake_src_configure
+}