sys-devel/flex: Sync with Gentoo

It's from Gentoo commit 0f4c0cca41ac0cb32d7632f6278d58d4a8cf88f1.

sdk_container/src/third_party/portage-stable/sys-devel/flex/flex-2.6.4-r5.ebuild

@@ -0,0 +1,100 @@
+# Copyright 1999-2022 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=8
+
+inherit flag-o-matic libtool multilib-minimal toolchain-funcs
+
+DESCRIPTION="The Fast Lexical Analyzer"
+HOMEPAGE="https://github.com/westes/flex"
+SRC_URI="https://github.com/westes/${PN}/releases/download/v${PV}/${P}.tar.gz"
+SRC_URI+=" https://dev.gentoo.org/~sam/distfiles/${CATEGORY}/${PN}/${P}-autotools-regenerate.patch.xz"
+
+LICENSE="FLEX"
+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"
+IUSE="nls static test"
+RESTRICT="!test? ( test )"
+
+RDEPEND="sys-devel/m4"
+# We want bison explicitly and not yacc in general, bug #381273
+BDEPEND="
+	${RDEPEND}
+	nls? ( sys-devel/gettext )
+	test? ( sys-devel/bison )
+"
+PDEPEND="app-alternatives/lex"
+
+PATCHES=(
+	"${FILESDIR}"/${P}-libobjdir.patch
+	"${FILESDIR}"/${P}-fix-build-with-glibc2.26.patch
+
+	"${WORKDIR}"/${P}-autotools-regenerate.patch
+)
+
+src_prepare() {
+	default
+
+	# Drop on next release when we can remove ${P}-autotools-regenerate.patch
+	touch configure.ac aclocal.m4 Makefile.in configure src/config.h.in || die
+
+	# Disable running in the tests/ subdir as it has a bunch of built sources
+	# that cannot be made conditional (automake limitation). bug #568842
+	if ! use test ; then
+		sed -i \
+			-e '/^SUBDIRS =/,/^$/{/tests/d}' \
+			Makefile.in || die
+	fi
+
+	# Prefix always needs this
+	elibtoolize
+}
+
+src_configure() {
+	use static && append-ldflags -static
+
+	multilib-minimal_src_configure
+}
+
+multilib_src_configure() {
+	# Do not install shared libs, #503522
+	ECONF_SOURCE="${S}" econf \
+		CC_FOR_BUILD="$(tc-getBUILD_CC)" \
+		--disable-shared \
+		$(use_enable nls)
+}
+
+multilib_src_compile() {
+	if multilib_is_native_abi; then
+		default
+	else
+		emake -C src -f Makefile -f - lib <<< 'lib: $(lib_LTLIBRARIES)'
+	fi
+}
+
+multilib_src_test() {
+	multilib_is_native_abi && emake check
+}
+
+multilib_src_install() {
+	if multilib_is_native_abi; then
+		default
+	else
+		emake -C src DESTDIR="${D}" install-libLTLIBRARIES install-includeHEADERS
+	fi
+}
+
+multilib_src_install_all() {
+	einstalldocs
+	dodoc ONEWS
+	find "${ED}" -name '*.la' -type f -delete || die
+	rm "${ED}"/usr/share/doc/${PF}/COPYING || die
+}
+
+pkg_postinst() {
+	# ensure to preserve the symlink before app-alternatives/lex
+	# is installed
+	if [[ ! -h ${EROOT}/usr/bin/lex ]]; then
+		ln -s flex "${EROOT}/usr/bin/lex" || die
+	fi
+}