81_libretro: a ZX-81 emulator for the libretro API (#2284)

app-emulation/81_libretro/81_libretro-1.0a_20171221.recipe

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+SUMMARY="A port of the EightyOne ZX-81 emulator to libretro"
+DESCRIPTION="81-libretro is an work in progress port of the EightyOne \
+(a.k.a. THE Sinclair Emulator) to libretro. It's being developed on Windows \
+with MinGW (64 bits) and Debian 8, and tested on RetroArch 1.2 frontend."
+HOMEPAGE="http://www.chuntey.com/"
+COPYRIGHT="2008-2018 Michael D Wynne, the libretro team"
+LICENSE="GNU GPL v3"
+REVISION="1"
+srcGitRev="6ae21e0980bb8190fe1fc3cb6c4f00797cc6bf0e"
+SOURCE_URI="https://github.com/libretro/81-libretro/archive/$srcGitRev.tar.gz"
+CHECKSUM_SHA256="3332f2777f4b6cc4a8d4109ba74063d1cd118cced49df91478e14fddc064fe68"
+SOURCE_FILENAME="81-libretro-${portVersion/_/-}-$srcGitRev.tar.gz"
+SOURCE_DIR="81-libretro-$srcGitRev"
+ADDITIONAL_FILES="81_libretro.info.in"
+
+ARCHITECTURES="!x86_gcc2 ?x86 x86_64"
+SECONDARY_ARCHITECTURES="x86"
+
+PROVIDES="
+	81_libretro$secondaryArchSuffix = $portVersion
+	addon:81_libretro$secondaryArchSuffix = $portVersion
+	"
+REQUIRES="
+	haiku$secondaryArchSuffix
+	retroarch$secondaryArchSuffix
+	"
+
+BUILD_REQUIRES="
+	haiku${secondaryArchSuffix}_devel
+	"
+BUILD_PREREQUIRES="
+	cmd:gcc$secondaryArchSuffix
+	cmd:make
+	"
+
+BUILD()
+{
+	sed -e "s/@DISPLAY_VERSION@/v${portVersion/_/-}/" \
+		$portDir/additional-files/81_libretro.info.in \
+		> 81_libretro.info
+	make -f Makefile.libretro $jobArgs
+}
+
+INSTALL()
+{
+	install -m 0755 -d "$docDir"
+	install -m 0644 -t "$docDir" README.md
+	install -m 0755 -d "$addOnsDir"/libretro
+	install -m 0644 -t "$addOnsDir"/libretro \
+		81_libretro.info \
+		81_libretro.so
+}

app-emulation/81_libretro/additional-files/81_libretro.info.in

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+display_name = "Sinclair - ZX 81 (EightyOne)"
+authors = "Michael D Wynne"
+supported_extensions = "p|tzx|t81"
+corename = "81"
+manufacturer = "Sinclair"
+categories = "Emulator"
+systemname = "ZX81"
+database = "Sinclair - ZX 81"
+license = "GPLv3"
+permissions = ""
+display_version = "@DISPLAY_VERSION@"
+supports_no_game = "false"
+notes = "[1] Amstrad have kindly given their permission for the redistribution|[^] of their copyrighted material but retain that copyright."