anchor.diff:  
   , libx11
   , libxext
  -, xextproto
  -, xineramaproto
  +, xorgproto
   }:
   
   stdenv.mkDerivation rec {
  
positive.code:       x86_64-linux;
    };
  }
  
  
negative.code:   buildInputs = [
      libx11
      libxext
      xorgproto
    ];
  
    configureFlags = [
  