anchor.diff:    src = fetchurl {
       url = "mirror://gnome/sources/glib/${channel}/${name}.tar.xz";
       hashOutput = false;
  -    sha256 = "97d6a9d926b6aa3dfaadad3077cfb43eec74432ab455dff14250c769d526d7d6";
  +    sha256 = "c7b24ed6536f1a10fc9bce7994e55c427b727602e78342821f1f07fb48753d4b";
     };
   
     nativeBuildInputs = [
  
positive.code:   '';
  
    channel = "2.58";
    version = "${channel}.1";
  in
  stdenv.mkDerivation rec {
    name = "glib-${version}";
  
negative.code:       ! find "$out" -name "$i"
        install -D -m 644 -v m4macros/"$i" "$out"/share/aclocal/"$i"
      done
    '';
  
    passthru = {
  