anchor.diff:      "--disable-gtk-doc"
       "--disable-gtk-doc-html"
       "--disable-gtk-doc-pdf"
  -    "--enable-checks"
  +    "--disable-checks"
       "--enable-Bsymbolic"
     ];
   
  -  meta = with stdenv.lib; {
  +  passthru = {
  +    srcVerification = fetchurl {
  +      failEarly = true;
  +      sha256Url = "https://download.gnome.org/sources/libcroco/${versionMajor}/"
  +        + "${name}.sha256sum";
  +      inherit (src) urls outputHash outputHashAlgo;
  +    };
  +  };
  +
  +  meta = with lib; {
       description = "Generic Cascading Style Sheet (CSS) parsing and manipulation";
       homepage = https://git.gnome.org/browse/libcroco/;
       license = licenses.lgpl2;
  
positive.code: 
    src = fetchurl {
      url = "mirror://gnome/sources/libcroco/${versionMajor}/${name}.tar.xz";
      sha256 = "0mm0wldbi40am5qn0nv7psisbg01k42rwzjxl3gv11l5jj554aqk";
    };
  
    buildInputs = [
  
negative.code: { stdenv
  , fetchurl
  , lib
  
  , glib
  , libxml2
  