{ stdenv, fetchurl, zlib }: assert !(stdenv ? cross) -> zlib != null; stdenv.mkDerivation rec { name = "libpng-1.2.55"; src = fetchurl { url = "mirror://sourceforge/libpng/${name}.tar.xz"; sha256 = "0zkra0b9lrpk2axassdgkqinmc2ba6b473sm52xbpyknaqs2fljy"; }; propagatedBuildInputs = [ zlib ]; passthru = { inherit zlib; }; crossAttrs = stdenv.lib.optionalAttrs (stdenv.cross.libc == "libSystem") { propagatedBuildInputs = []; passthru = {}; }; configureFlags = "--enable-static"; meta = with stdenv.lib; { description = "The official reference implementation for the PNG file format"; homepage = http://www.libpng.org/pub/png/libpng.html; license = licenses.libpng; maintainers = [ maintainers.fuuzetsu ]; branch = "1.2"; }; }