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diff --git a/dev-lang/luajit/luajit-2.1.1727870382.ebuild b/dev-lang/luajit/luajit-2.1.1727870382.ebuild
new file mode 100644
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@@ -0,0 +1,70 @@
+# Copyright 1999-2024 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=8
+GIT_COMMIT=97813fb924edf822455f91a5fbbdfdb349e5984f
+GIT_COMMIT_RISCV=1893cf72c264f837596614a537a18e83b8c1b678
+
+# Upstream doesn't make releases anymore and instead have a (broken) "rolling
+# git tag" model.
+#
+# https://github.com/LuaJIT/LuaJIT/issues/665#issuecomment-784452583
+# https://www.freelists.org/post/luajit/LuaJIT-uses-rolling-releases
+#
+# Regular snapshots should be made from the v2.1 branch. Get the version with
+# `git show -s --format=%ct`
+
+inherit toolchain-funcs
+
+DESCRIPTION="Just-In-Time Compiler for the Lua programming language"
+HOMEPAGE="https://luajit.org/"
+SRC_URI="
+	https://github.com/LuaJIT/LuaJIT/archive/${GIT_COMMIT}.tar.gz -> ${P}.tar.gz
+	https://github.com/plctlab/LuaJIT/compare/${GIT_COMMIT}..${GIT_COMMIT_RISCV}.patch -> ${P}-RISCV-support.patch
+"
+S="${WORKDIR}/LuaJIT-${GIT_COMMIT}"
+
+LICENSE="MIT"
+# this should probably be pkgmoved to 2.0 for sake of consistency.
+SLOT="2/${PV}"
+KEYWORDS="-* ~riscv"
+IUSE="lua52compat static-libs"
+
+PATCHES=(
+	"${DISTDIR}/${P}-RISCV-support.patch"
+)
+
+_emake() {
+	emake \
+		Q= \
+		PREFIX="${EPREFIX}/usr" \
+		MULTILIB="$(get_libdir)" \
+		DESTDIR="${D}" \
+		CFLAGS="" \
+		LDFLAGS="" \
+		HOST_CC="$(tc-getBUILD_CC)" \
+		HOST_CFLAGS="${BUILD_CPPFLAGS} ${BUILD_CFLAGS}" \
+		HOST_LDFLAGS="${BUILD_LDFLAGS}" \
+		STATIC_CC="$(tc-getCC)" \
+		DYNAMIC_CC="$(tc-getCC) -fPIC" \
+		TARGET_LD="$(tc-getCC)" \
+		TARGET_CFLAGS="${CPPFLAGS} ${CFLAGS}" \
+		TARGET_LDFLAGS="${LDFLAGS}" \
+		TARGET_AR="$(tc-getAR) rcus" \
+		BUILDMODE="$(usex static-libs mixed dynamic)" \
+		TARGET_STRIP="true" \
+		INSTALL_LIB="${ED}/usr/$(get_libdir)" \
+		"$@"
+}
+
+src_compile() {
+	tc-export_build_env
+	_emake XCFLAGS="$(usex lua52compat "-DLUAJIT_ENABLE_LUA52COMPAT" "")"
+}
+
+src_install() {
+	_emake install
+	dosym luajit-"${PV}" /usr/bin/luajit
+
+	HTML_DOCS="doc/." einstalldocs
+}