add greybird ebuild based on meson build

x11-themes/greybird/Manifest

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+EBUILD greybird-9999.ebuild 973 BLAKE2B d919d314d2a662f3c33e72eee26aebc73fd14963f50936ce7b88067cd14d039d19945eaec515d812269ff46779de082b1955841e35c6d32cbe48af5b754f4895 SHA512 0c1f2d108dbe070205791bcb8e54e91084700b3f7d8f215e000795b32848d004da96517628e3d5a24c74e3ca3078f63d0ad0ec2babdd6720ea15a9182cba0a99
+MISC metadata.xml 437 BLAKE2B 2c6f93604ac1c8b907f31e1a3ac813c13fd72a97bd0ecd5071c61d9729d05de4bb7dd1f4f35c1af2fd8c48beb674534d58a9b40e4b441ba75ca1210cb88b4a3a SHA512 06ee186a69379acc1e8dc3b353e3a86c4a914a1c529d9148eda9f9b11887d58183dc24da8a600fb37252f806d9703a9dc37b14ee7b080204d89d53c3d940193e

x11-themes/greybird/greybird-9999.ebuild

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+# Copyright 1999-2019 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=7
+inherit git-r3 meson
+
+MY_PN=${PN/g/G}
+
+DESCRIPTION="The default theme from Xubuntu"
+HOMEPAGE="http://shimmerproject.org/project/greybird/ https://github.com/shimmerproject/Greybird"
+EGIT_REPO_URI="https://github.com/shimmerproject/${MY_PN}"
+
+# README says "dual-licensed as GPLv2 or later and CC-BY-SA 3.0 or later"
+LICENSE="CC-BY-SA-3.0 GPL-2+"
+SLOT="0"
+KEYWORDS=""
+IUSE=""
+
+RDEPEND="
+	>=x11-libs/gtk+-3.22:3
+	>=x11-themes/gtk-engines-murrine-0.90
+"
+DEPEND="
+	${RDEPEND}
+	dev-lang/sassc
+	dev-libs/glib:2
+"
+
+pkg_postinst() {
+	if ! has_version x11-themes/elementary-xfce-icon-theme ; then
+		elog "For upstream's default icon theme, please emerge"
+		elog "x11-themes/elementary-xfce-icon-theme"
+	fi
+	if ! has_version x11-themes/vanilla-dmz-xcursors ; then
+		elog "For upstream's default cursor theme, please emerge"
+		elog "x11-themes/vanilla-dmz-xcursors"
+	fi
+}

x11-themes/greybird/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="project">
+<email>desktop-misc@gentoo.org</email>
+<name>Gentoo Desktop Miscellaneous Project</name>
+</maintainer>
+<use>
+<flag name='xfce'>Install theme for <pkg>xfce-base/xfwm4</pkg></flag>
+</use>
+<upstream>
+<remote-id type="github">shimmerproject/Greybird</remote-id>
+</upstream>
+</pkgmetadata>