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diff --git a/dev-ruby/parallel/parallel-1.20.0.ebuild b/dev-ruby/parallel/parallel-1.20.0.ebuild
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+# Copyright 1999-2020 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=7
+
+USE_RUBY="ruby25 ruby26 ruby27"
+
+RUBY_FAKEGEM_RECIPE_TEST="rspec3"
+
+RUBY_FAKEGEM_EXTRAINSTALL="Readme.md"
+
+RUBY_FAKEGEM_GEMSPEC="parallel.gemspec"
+
+inherit ruby-fakegem
+
+DESCRIPTION="Run any code in parallel Processes or Threads"
+HOMEPAGE="https://github.com/grosser/parallel"
+LICENSE="MIT"
+SRC_URI="https://github.com/grosser/parallel/archive/v${PV}.tar.gz -> ${P}.tar.gz"
+
+KEYWORDS="~amd64"
+SLOT="1"
+IUSE="test"
+
+DEPEND+="test? ( sys-process/lsof sys-process/procps )"
+
+ruby_add_bdepend "
+	test? ( dev-ruby/ruby-progressbar dev-ruby/activerecord:6.0 dev-ruby/sqlite3 )"
+
+each_ruby_prepare() {
+	# Make sure the correct ruby is used for testing
+	sed -e 's:ruby :'${RUBY}' :' -i spec/parallel_spec.rb || die
+}
+
+all_ruby_prepare() {
+	sed -i -e 's/git ls-files/find/' ${RUBY_FAKEGEM_GEMSPEC} || die
+	sed -i -e '/bundler/ s:^:#:' \
+		-e '1i require "tempfile"; gem "activerecord", "~>6.0.0"' spec/cases/helper.rb || die
+	sed -i -e '3irequire "timeout"' spec/spec_helper.rb || die
+
+	# Avoid a failing spec regarding to pipes. The spec seems like it
+	# should always fail.
+	sed -e '/does not open unnecessary pipes/,/end/ s:^:#:' \
+		-i spec/parallel_spec.rb || die
+
+	# Avoid fragile ar sqlite tests. They throw ReadOnly errors every now and then.
+	sed -i -e '/works with SQLite in/,/end/ s:^:#:' spec/parallel_spec.rb || die
+
+	# Avoid spec broken on Ruby 2.1 that clearly doesn't match code and doesn't really test anything
+	sed -i -e '/doesnt use Etc.nprocessors in Ruby 2.1 and below/,/end/ s:^:#:' spec/parallel_spec.rb || die
+}
+
+each_ruby_test() {
+	# Set RUBYLIB explicitly for the ruby's that get started from the specs.
+	TRAVIS=true RUBYLIB="lib" ${RUBY} -S rspec-3 spec || die
+}