nixpkgs/pkgs/development/libraries/libxml2/default.nix

{stdenv, fetchurl, zlib, python ? null, pythonSupport ? true}:

assert pythonSupport -> python != null;

stdenv.mkDerivation ({
  name = "libxml2-2.7.3";

  src = fetchurl {
    url = ftp://xmlsoft.org/libxml2/libxml2-sources-2.7.3.tar.gz;
    sha256 = "01bgxgvl0gcx97zmlz9f2ivgbiv86kqbs9l93n2cbxywv1pc4jd5";
  };

  configureFlags = ''
    ${if pythonSupport then "--with-python=${python}" else ""}
  '';

  patchPhase = ''
    sed -e "s^pythondir=.*$^pythondir=$out/lib/python2.4/site-packages^" -i configure
  '';

  passthru = {inherit pythonSupport;};

  propagatedBuildInputs = [zlib];

  postInstall = ''
    ensureDir $out/nix-support
    cp ${./setup-hook.sh} $out/nix-support/setup-hook
  '';

  meta = {
    homepage = http://xmlsoft.org/;
    description = "A XML parsing library for C";
  };
} // (if pythonSupport then {
  preConfigure = ''
    sed -e "s^pythondir=.*$^pythondir=$(toPythonPath $out)^" < configure.old > configure
  '';
} else {}))