Diff libpng-compat-1.2.59-r1 with a libpng-compat-1.5.30-r1

/usr/portage/media-libs/libpng-compat/libpng-compat-1.5.30-r1.ebuild 2023-10-09 14:52:31.692368406 +0300
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EAPI=8
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# This ebuild is only for the libpng12.so.0 SONAME for ABI compat
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# This ebuild is only for the libpng15.so.15 SONAME for ABI compat
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inherit libtool multilib-minimal
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MY_P=libpng-${PV}
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MY_P="libpng-${PV}"
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DESCRIPTION="Portable Network Graphics library"
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HOMEPAGE="http://www.libpng.org/"
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SRC_URI="mirror://sourceforge/libpng/${MY_P}.tar.xz"
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S="${WORKDIR}"/${MY_P}
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S="${WORKDIR}/${MY_P}"
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LICENSE="libpng"
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SLOT="1.2"
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KEYWORDS="~alpha amd64 ~arm ~arm64 ~hppa ~ia64 ~m68k ~mips ~ppc64 ~s390 ~sparc x86 ~amd64-linux ~x86-linux"
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SLOT="1.5"
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KEYWORDS="~alpha amd64 ~arm ~arm64 ~hppa ~ia64 ~m68k ~mips ~ppc ~ppc64 ~s390 ~sparc x86 ~amd64-linux ~x86-linux ~ppc-macos ~x64-macos ~x64-solaris"
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IUSE="cpu_flags_arm_neon"
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RDEPEND="
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	>=sys-libs/zlib-1.2.8-r1:=[${MULTILIB_USEDEP}]
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	!=media-libs/libpng-1.2*
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	sys-libs/zlib:=[${MULTILIB_USEDEP}]
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	!=media-libs/libpng-1.5*
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"
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DEPEND="${RDEPEND}"
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......
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# old library for compatibility. Use libpng for the full contents.
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DOCS=()
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pkg_setup() {
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	local _preserved_lib="${EROOT}/usr/$(get_libdir)/libpng15.so.15"
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	[[ -e ${_preserved_lib} ]] && rm -f "${_preserved_lib}"
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}
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src_prepare() {
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	default
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......
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}
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multilib_src_configure() {
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	ECONF_SOURCE="${S}" econf
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	local myeconfargs=(
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		$(use_enable cpu_flags_arm_neon arm-neon check)
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	)
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	ECONF_SOURCE="${S}" econf "${myeconfargs[@]}"
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}
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multilib_src_compile() {
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	emake libpng12.la
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	emake libpng15.la
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}
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multilib_src_install() {
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	newlib.so .libs/libpng12.so.0.* libpng12.so.0
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	newlib.so .libs/libpng15.so.15.* libpng15.so.15
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}
Thank you!