dev-ml/xen-evtchn: initial import

Signed-off-by: Alessandro Barbieri <lssndrbarbieri@gmail.com>

dev-ml/xen-evtchn/Manifest

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+DIST xen-evtchn-v2.1.0.tbz 6877 BLAKE2B 458250df905a5b32f62161e06c637823c35933463418d13ee0b6aa2e7fd8146d9a019bf0bb6f8a125e73c0470789254728fceb27cfd24887660f246b87d48ea6 SHA512 df7d767432d450c19b5f26a85f9d442f5b5eab2013a1733c5b04b820043b61cad814813c322f7c6ce2f000b7428941b8a83f6c1059d0ee88947df9f16029d92d

dev-ml/xen-evtchn/metadata.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE pkgmetadata SYSTEM "http://www.gentoo.org/dtd/metadata.dtd">
+<pkgmetadata>
+    <maintainer type="person">
+        <email>lssndrbarbieri@gmail.com</email>
+        <name>Alessandro Barbieri</name>
+    </maintainer>
+    <upstream>
+        <remote-id type="github">mirage/evtchn</remote-id>
+    </upstream>
+    <use>
+        <flag name="unix">Xen event channel interface for Linux</flag>
+    </use>
+</pkgmetadata>

dev-ml/xen-evtchn/xen-evtchn-2.1.0.ebuild

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+# Copyright 1999-2022 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=8
+
+inherit dune multiprocessing
+
+MY_P="${PN}-v${PV}"
+
+DESCRIPTION="Xen event channel interface for Mirage"
+HOMEPAGE="https://github.com/mirage/ocaml-evtchn"
+SRC_URI="https://github.com/mirage/ocaml-evtchn/releases/download/v${PV}/${MY_P}.tbz"
+S="${WORKDIR}/${MY_P}"
+
+LICENSE="ISC"
+SLOT="0/${PV}"
+KEYWORDS="~amd64"
+IUSE="ocamlopt test unix"
+
+RDEPEND="
+	dev-ml/lwt
+	dev-ml/lwt-dllist
+	dev-ml/cmdliner
+
+	unix? ( app-emulation/xen )
+"
+DEPEND="
+	${RDEPEND}
+	test? ( dev-ml/ounit )
+"
+
+RESTRICT="!test? ( test )"
+REQUIRED_USE="test? ( unix )"
+
+src_compile() {
+	local pkgs="xen-evtchn"
+	use unix && pkgs="${pkgs},xen-evtchn-unix"
+	dune build --only-packages "${pkgs}" -j $(makeopts_jobs) --profile release || die
+}
+
+src_install() {
+	dune_src_install xen-evtchn
+	use unix && dune_src_install xen-evtchn-unix
+}