anchor.diff:  self: super:
   {
     bdftopcf = super.bdftopcf.overrideAttrs (attrs: {
  -    buildInputs = attrs.buildInputs ++ [ self.xproto self.fontsproto ];
  +    buildInputs = attrs.buildInputs ++ [ self.xorgproto ];
     });
   
     bitmap = super.bitmap.overrideAttrs (attrs: {
  
positive.code:         rm -rf $out/share/doc
        '';
      CPP = stdenv.lib.optionalString stdenv.isDarwin "clang -E -";
    });
  
    libAppleWM = super.libAppleWM.overrideAttrs (attrs: {
  
negative.code: 
    libXau = super.libXau.overrideAttrs (attrs: {
      outputs = [ "out" "dev" ];
      propagatedBuildInputs = [ self.xorgproto ];
    });
  
    libXdmcp = super.libXdmcp.overrideAttrs (attrs: {
  