{ pngSupport ? true , stdenv, fetchurl, x11, libpng ? null}: assert x11 != null; assert pngSupport -> libpng != null; stdenv.mkDerivation { name = "zvbi-0.2.5"; builder = ./builder.sh; src = fetchurl { url = http://heanet.dl.sourceforge.net/sourceforge/zapping/zvbi-0.2.5.tar.bz2; md5 = "06b370565246758813f6580797369518"; }; x11 = x11; pngSupport = pngSupport; libpng = if pngSupport then libpng else null; }