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diff --git a/dev-lang/idris2/idris2-0.5.1_p20220131.ebuild b/dev-lang/idris2/idris2-0.5.1_p20220131.ebuild
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+# Copyright 1999-2022 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=8
+
+H=a2c7e9f306ea8ff935bbeff1eac764291b12ce87
+
+inherit toolchain-funcs
+
+DESCRIPTION="Purely functional programming language with first class types"
+HOMEPAGE="https://idris-lang.org/"
+
+if [[ "${PV}" == *9999* ]] ; then
+	inherit git-r3
+	EGIT_REPO_URI="https://github.com/idris-lang/Idris2.git"
+else
+	SRC_URI="https://github.com/idris-lang/Idris2/archive/${H}.tar.gz -> ${P}.tar.gz"
+	KEYWORDS="~amd64 ~x86"
+	S="${WORKDIR}/${PN^}-${H}"
+fi
+
+LICENSE="BSD"
+SLOT="0"
+IUSE="+chez doc racket test-full"
+REQUIRED_USE="^^ ( chez racket )"
+
+RDEPEND="
+	dev-libs/gmp
+	chez? ( dev-scheme/chez[threads] )
+	racket? ( dev-scheme/racket[threads] )
+"
+DEPEND="${RDEPEND}"
+BDEPEND="
+	doc? ( dev-python/sphinx_rtd_theme )
+	test-full? (
+		dev-scheme/chez[threads]
+		dev-scheme/racket[threads]
+		net-libs/nodejs
+	)
+"
+
+# Generated via "SCHEME", not CC
+QA_FLAGS_IGNORED="usr/lib/idris2/bin/idris2_app/idris2
+	usr/lib/idris2/bin/idris2_app/idris2-boot"
+QA_PRESTRIPPED="${QA_FLAGS_IGNORED}"
+
+src_prepare() {
+	# Clean up environment of Idris and Racket variables
+	unset IDRIS2_DATA IDRIS2_INC_CGS IDRIS2_LIBS IDRIS2_PACKAGE_PATH
+	unset IDRIS2_PATH IDRIS2_PREFIX
+	unset PLTUSERHOME
+
+	tc-export AR CC CXX LD RANLIB
+	export CFLAGS
+	sed -i '/^CFLAGS/d' ./support/*/Makefile || die
+
+	# Fix "PREFIX"
+	sed -i 's|$(HOME)/.idris2|/usr/lib/idris2|g' ./config.mk || die
+
+	# Bad tests
+	sed -i 's|, "futures001"||g' ./tests/Main.idr || die
+	# > Missing incremental compile data, reverting to whole program compilation
+	sed -i 's|"chez033",||g' ./tests/Main.idr || die
+
+	default
+}
+
+src_configure() {
+	export IDRIS2_VERSION=${PV}
+	export SCHEME=$(usex chez chezscheme racket)
+
+	if use chez ; then
+		export IDRIS2_CG=chez
+		export BOOTSTRAP_TARGET=bootstrap
+	elif use racket ; then
+		export IDRIS2_CG=racket
+		export BOOTSTRAP_TARGET=bootstrap-racket
+	else
+		die "Neither chez nor racket was chosen"
+	fi
+}
+
+src_compile() {
+	# > jobserver unavailable
+	# This is caused by Makefile using a script which in turn calls make
+	# https://github.com/idris-lang/Idris2/issues/2152
+	emake SCHEME=${SCHEME} ${BOOTSTRAP_TARGET} -j1
+
+	use doc && emake -C ./docs html
+}
+
+src_test() {
+	emake SCHEME=${SCHEME} bootstrap-test
+}
+
+src_install() {
+	# "DESTDIR" variable is not respected
+	emake IDRIS2_PREFIX="${D}"/usr/lib/idris2 PREFIX="${D}"/usr/lib/idris2 install
+	dosym ../lib/${PN}/bin/${PN} /usr/bin/${PN}
+
+	# Install documentation
+	use doc && dodoc -r ./docs/build/html
+	einstalldocs
+}