anchor.diff:  
     src = fetchurl {
       url = "mirror://gnome/sources/libcroco/${versionMajor}/${name}.tar.xz";
  -    sha256 = "0mm0wldbi40am5qn0nv7psisbg01k42rwzjxl3gv11l5jj554aqk";
  +    sha256 = "ddc4b5546c9fb4280a5017e2707fbd4839034ed1aba5b7d4372212f34f84f860";
     };
   
     buildInputs = [
  
positive.code: { stdenv
  , fetchurl
  
  , glib
  , libxml2
  
negative.code:     "--disable-gtk-doc"
      "--disable-gtk-doc-html"
      "--disable-gtk-doc-pdf"
      "--disable-checks"
      "--enable-Bsymbolic"
    ];
  
    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;
  