Add looking-glass git ebuild.

Very finnicky.

app-emulation/looking-glass/Manifest

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+EBUILD looking-glass-9999.ebuild 1660 BLAKE2B e477ba3a6b344422edeb466dffb483a7960b8bfcda87414762c35edf393e74bee2177c63552d9972c784d48650c986e514bf8253fcb563799b210627ea68764e SHA512 e88648fd97fa5febd4ac0c05c2573277ee620d7873b20b8fe60e2a03c98cd3a188a66aea0c4d5cc485daf0144331da6eca3699e21cb5f0dce2d68855b1ebf242
+MISC metadata.xml 329 BLAKE2B c613c0d366e5c79b96f4707dd6b2c4d41a627b2b5f5a2a29f58c2ea239b891b9e2f1bf43d2d436127004eecd416dd3d59dcd88e8bfe4c977b3953f55756c528a SHA512 439861039e04a7d9b7b1cf4c1c404698dc2322d7786c8779cf3f24060d7bf4f966b104c94d44fbce72874b8c9fbaac5bc058d33c9e2bea1b2e38adca24df3b64

app-emulation/looking-glass/looking-glass-9999.ebuild

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+# Copyright 1999-2020 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=7
+
+MY_PN="LookingGlass"
+MY_PV="${PV//1_beta/B}"
+MY_P="${MY_PN}-${MY_PV}"
+
+inherit cmake git-r3
+
+DESCRIPTION="A low latency KVM FrameRelay implementation for guests with VGA PCI Passthrough"
+HOMEPAGE="https://looking-glass.hostfission.com https://github.com/gnif/LookingGlass/"
+EGIT_REPO_URI="https://github.com/gnif/LookingGlass.git"
+EGIT_SUBMODULES=()
+
+LICENSE="GPL-2"
+SLOT="0"
+KEYWORDS="~amd64 ~x86"
+IUSE="debug"
+
+RDEPEND="app-emulation/spice-protocol"
+DEPEND="${RDEPEND}
+	dev-libs/libconfig:0=
+	dev-libs/nettle:=[gmp]
+	media-libs/freetype:2
+	media-libs/fontconfig:1.0
+	media-libs/libsdl2:=[gles2]
+	media-libs/sdl2-ttf
+	virtual/glu"
+BDEPEND="virtual/pkgconfig"
+
+src_unpack(){
+	mkdir looking-glass-9999
+	git clone --recursive "https://github.com/gnif/LookingGlass.git" looking-glass-9999 || die "git clone failed"
+}
+
+src_prepare() {
+	default
+
+	# Respect FLAGS
+	sed -i -e '/CMAKE_C_FLAGS/s/-O3 -march=native //' \
+		-e "/git/s/git describe --always --long --dirty --abbrev=10 --tags/echo ${MY_PV}/" \
+		client/CMakeLists.txt || die "sed failed for FLAGS and COMMAND"
+
+	if ! use debug ; then
+		sed -i '/CMAKE_C_FLAGS/s/-g //' \
+		client/CMakeLists.txt || die "sed failed for debug"
+	fi
+	cp client/CMakeLists.txt . || die "copy cmakelists failed"
+	cmake_src_prepare
+}
+
+src_configure() {
+	einfo "I don't really know what I'm doing"
+}
+
+src_compile(){
+	mkdir client/build
+	cd client/build
+	cmake ../ || die "cmake failed"
+	make || die "make failed"
+}
+
+src_install() {
+    einstalldocs
+    dobin client/build/looking-glass-client || die "install failed"
+}

app-emulation/looking-glass/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> knotteye@airmail.cc </email>
+		<name> KnottEye </name>
+	</maintainer>
+	<upstream>
+		<remote-id type="github">gnif/LookingGlass</remote-id>
+	</upstream>
+</pkgmetadata>