{stdenv, fetchurl, zlib, python ? null, pythonSupport ? true}: assert zlib != null; assert pythonSupport -> python != null; stdenv.mkDerivation { name = "libxml2-2.6.29"; builder = ./builder.sh; src = fetchurl { url = ftp://xmlsoft.org/libxml2/libxml2-2.6.29.tar.gz; sha256 = "14jrjvdbvlbc3m0q9p3np67sk18w317n5zfg9a3h7b6pp7h1jjp3"; }; python = if pythonSupport then python else null; inherit pythonSupport zlib; buildInputs = if pythonSupport then [python] else []; propagatedBuildInputs = [zlib]; }