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diff --git a/sci-mathematics/coq/coq-8.20.0-r1.ebuild b/sci-mathematics/coq/coq-8.20.0-r1.ebuild
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+# Copyright 1999-2025 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=8
+
+inherit check-reqs desktop dune edo
+
+DESCRIPTION="Proof assistant written in O'Caml"
+HOMEPAGE="https://coq.inria.fr/
+	https://github.com/coq/coq/"
+
+if [[ "${PV}" == *9999* ]] ; then
+	inherit git-r3
+
+	EGIT_REPO_URI="https://github.com/coq/coq.git"
+else
+	SRC_URI="https://github.com/coq/coq/archive/V${PV}.tar.gz
+		-> ${P}.tar.gz"
+
+	KEYWORDS="amd64 ~arm64 ~x86"
+fi
+
+LICENSE="LGPL-2.1"
+SLOT="0/${PV}"
+IUSE="debug doc gui +ocamlopt test"
+
+# TODO: Lots of failing tests. Maybe investigate later.
+# RESTRICT="!test? ( test )"
+RESTRICT="test"
+
+RDEPEND="
+	dev-ml/num:=
+	dev-ml/zarith:=
+	gui? (
+		>=dev-ml/lablgtk-3.1.2:3=[sourceview,ocamlopt?]
+		>=dev-ml/lablgtk-sourceview-3.1.2:3=[ocamlopt?]
+	)
+"
+DEPEND="
+	${RDEPEND}
+"
+BDEPEND="
+	dev-ml/findlib
+	doc? (
+		>=dev-java/antlr-4.7:4
+		dev-python/antlr4-python3-runtime
+		dev-python/beautifulsoup4
+		dev-python/pexpect
+		dev-python/sphinx-rtd-theme
+		dev-python/sphinxcontrib-bibtex
+		dev-tex/latexmk
+		dev-texlive/texlive-fontsextra
+		dev-texlive/texlive-latexextra
+		dev-texlive/texlive-xetex
+		media-fonts/freefont
+	)
+	test? (
+		dev-ml/ounit2
+	)
+	<dev-lang/ocaml-5
+"
+
+CHECKREQS_DISK_BUILD="2G"
+
+DOCS=( CODE_OF_CONDUCT.md CONTRIBUTING.md CREDITS INSTALL.md README.md )
+DUNE_PACKAGES=()
+
+src_prepare() {
+	# Remove bad tests (recursive).
+	local -a bad_tests=(
+		coq-makefile/timing-aggregate
+		coq-makefile/timing-error
+		coq-makefile/timing-per-file
+		coq-makefile/timing-per-line
+		coq-makefile/timing-template
+	)
+	local bad_test=""
+	for bad_test in "${bad_tests[@]}" ; do
+		if [[ -e "test-suite/${bad_test}" ]] ; then
+			rm -r "test-suite/${bad_test}" || die "failed to remove test ${bad_test}"
+		else
+			ewarn "Test file ${bad_test} does not exist"
+		fi
+	done
+
+	default
+}
+
+src_configure() {
+	export CAML_LD_LIBRARY_PATH="${S}/kernel/byterun/"
+
+	DUNE_PACKAGES=(
+		coq-core
+		coq-stdlib
+		coqide-server
+		coq
+	)
+	use gui && DUNE_PACKAGES+=( coqide )
+
+	emake clean
+
+	local -a myconf=(
+		-prefix /usr
+		-libdir "/usr/$(get_libdir)/coq"
+		-mandir /usr/share/man
+		-docdir "/usr/share/doc/${PF}"
+		-datadir /usr/share/coq
+		-configdir "/etc/xdg/${PN}"
+		-native-compiler "$(usex ocamlopt yes no)"
+	)
+	use debug && myconf+=( -debug )
+	edo sh ./configure "${myconf[@]}"
+}
+
+src_compile() {
+	emake DUNEOPT="--display=short --profile release" VERBOSE="1" dunestrap
+
+	dune-compile "${DUNE_PACKAGES[@]}"
+
+	use doc && emake refman-html
+}
+
+src_install() {
+	dune-install "${DUNE_PACKAGES[@]}"
+
+	if use gui ; then
+		make_desktop_entry coqide "Coq IDE" "${EPREFIX}/usr/share/coq/coq.png"
+	fi
+
+	local ocamlc_where="$(ocamlc -where)"
+
+	# Dune installs into /usr/<libdir>/ocaml/<coq> but
+	# Coq wants /usr/<libdir>/<coq> ; symlink those directories
+	local sym=""
+	for sym in "${DUNE_PACKAGES[@]}" ; do
+		dosym "${ocamlc_where}/${sym}" "/usr/$(get_libdir)/${sym}"
+	done
+
+	einstalldocs
+}