--- /dev/null
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE pkgmetadata SYSTEM "http://www.gentoo.org/dtd/metadata.dtd">
+<pkgmetadata>
+<maintainer type="project">
+ <email>ml@gentoo.org</email>
+ <name>Gentoo ML Project</name>
+</maintainer>
+</pkgmetadata>
--- /dev/null
+# Copyright 1999-2017 Gentoo Foundation
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=6
+
+inherit findlib
+
+DESCRIPTION="Meta Language Toolchain"
+HOMEPAGE="https://github.com/facebook/reason"
+SRC_URI="https://github.com/facebook/reason/archive/${PV}.tar.gz -> ${P}.tar.gz"
+
+LICENSE="BSD"
+SLOT="0/${PV}"
+KEYWORDS="~amd64"
+IUSE="+ocamlopt"
+
+DEPEND="
+ dev-lang/ocaml:=[ocamlopt?]
+ dev-ml/menhir:=
+ dev-ml/merlin-extend:=
+ dev-ml/result:=
+ dev-ml/topkg:=
+ dev-ml/ocaml-migrate-parsetree:=
+ dev-ml/ppx_tools_versioned:=
+"
+RDEPEND="${DEPEND}"
+DEPEND="${DEPEND}
+ dev-ml/ocamlbuild
+ dev-ml/opam
+"
+
+S="${WORKDIR}/reason-${PV}/${PN}"
+
+src_compile() {
+ emake compile_error
+ ocamlbuild -package topkg pkg/build.native || die
+ ./build.native build \
+ --native "$(usex ocamlopt true false)" \
+ --native-dynlink "$(usex ocamlopt true false)" \
+ || die
+}
+
+src_install() {
+ opam-installer -i \
+ --prefix="${ED}/usr" \
+ --libdir="${D}/$(ocamlc -where)" \
+ --docdir="${ED}/usr/share/doc/${PF}" \
+ --mandir="${ED}/usr/share/man" \
+ ${PN}.install || die
+}