dev-ruby/libusb: add extension installed marker manually

This gem has an extension that is a no-op when using system
libusb. Install the "extension installed" marker manually to make
rubygems happy.

Closes: https://bugs.gentoo.org/901973
Signed-off-by: Hans de Graaff <graaff@gentoo.org>

dev-ruby/libusb/libusb-0.6.4-r2.ebuild

@@ -0,0 +1,47 @@
+# Copyright 2022-2023 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=8
+
+USE_RUBY="ruby27 ruby30 ruby31"
+
+RUBY_FAKEGEM_EXTRADOC="History.md README.md"
+RUBY_FAKEGEM_GEMSPEC="${PN}.gemspec"
+
+inherit ruby-fakegem
+
+DESCRIPTION="binding that gives Ruby programmers access to arbitrary USB devices"
+HOMEPAGE="https://github.com/larskanis/libusb"
+
+LICENSE="BSD"
+SLOT="0"
+KEYWORDS="~amd64 ~x86"
+IUSE=""
+
+DEPEND+="virtual/libusb:1"
+RDEPEND+="${DEPEND}"
+
+ruby_add_rdepend "dev-ruby/ffi:0"
+ruby_add_bdepend "test? ( dev-ruby/eventmachine )"
+
+all_ruby_prepare() {
+	sed -e '/mini_portile2/d' \
+		-e 's/git ls-files --/find/' \
+		-i ${RUBY_FAKEGEM_GEMSPEC} || die
+
+	# Avoid tests that try to open devices or depend on specific hardware
+	rm -f test/test_libusb_{bos,descriptors}.rb || die
+}
+
+each_ruby_test() {
+	${RUBY} -I.:lib -e "Dir['test/test_*.rb'].each{|f| require f}" || die
+}
+
+each_ruby_install() {
+	each_fakegem_install
+
+	# This gem includes an extension that does not actually do anything
+	# when using the system libusb, but newer rubygems versions still
+	# require the marker to be present.
+	ruby_fakegem_extensions_installed
+}