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diff --git a/dev-python/pycparser/pycparser-2.21-r1.ebuild b/dev-python/pycparser/pycparser-2.21-r1.ebuild
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+# Copyright 1999-2022 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+# please keep this ebuild at EAPI 7 -- sys-apps/portage dep
+EAPI=7
+
+DISTUTILS_USE_PEP517=setuptools
+PYTHON_COMPAT=( python3_{7,8,9,10} pypy3 )
+
+inherit distutils-r1
+
+DESCRIPTION="C parser and AST generator written in Python"
+HOMEPAGE="
+	https://github.com/eliben/pycparser/
+	https://pypi.org/project/pycparser/
+"
+SRC_URI="mirror://pypi/${PN:0:1}/${PN}/${P}.tar.gz"
+
+LICENSE="BSD"
+SLOT="0"
+KEYWORDS="~alpha ~amd64 ~arm ~arm64 ~hppa ~ia64 ~loong ~m68k ~mips ~ppc ~ppc64 ~riscv ~s390 ~sparc ~x86 ~x64-cygwin ~amd64-linux ~x86-linux ~ppc-macos ~x64-macos ~sparc-solaris ~sparc64-solaris ~x64-solaris ~x86-solaris"
+
+RDEPEND="
+	dev-python/ply:=[${PYTHON_USEDEP}]
+"
+BDEPEND="
+	${RDEPEND}
+"
+
+distutils_enable_tests unittest
+
+python_prepare_all() {
+	# remove the original files to guarantee their regen
+	rm pycparser/{c_ast,lextab,yacctab}.py || die
+
+	# kill sys.path manipulations to force the tests to use built files
+	sed -i -e '/sys\.path/d' tests/*.py || die
+
+	# Ensure we can find tests in our directory
+	sed -i -e 's/from tests.test_util/from test_util/g' tests/test_*.py || die
+
+	ln -s "${S}"/examples tests/examples || die
+
+	rm tests/test_examples.py || die
+
+	distutils-r1_python_prepare_all
+}
+
+python_test() {
+	# Skip tests if cpp is not in PATH
+	type -P cpp >/dev/null || return 0
+	# change workdir to avoid '.' import
+	cd tests || die
+
+	# Ensure that 'cpp' is called with the right arguments
+	# Tests don't seem to always pass the include they intend to use.
+	mkdir -p "${T}"/bin || die
+	cat > "${T}"/bin/cpp <<-EOF || die
+	#!${BROOT}/bin/bash
+	exec ${BROOT}/usr/bin/cpp -I${S}/utils/fake_libc_include/ \$@
+	EOF
+	chmod +x "${T}"/bin/cpp || die
+
+	PATH="${T}/bin:${PATH}" eunittest
+}