anchor.diff:      name = "xcb-util-renderutil-0.3.9";
       builder = ./builder.sh;
       src = fetchurl {
  -      url = http://xcb.freedesktop.org/dist/xcb-util-renderutil-0.3.9.tar.bz2;
  +      url = mirror://xorg/individual/xcb/xcb-util-renderutil-0.3.9.tar.bz2;
         sha256 = "0nza1csdvvxbmk8vgv8vpmq7q8h05xrw3cfx9lwxd1hjzd47xsf6";
       };
       nativeBuildInputs = [ gperf m4 xproto ];
  
positive.code:     name = "libpthread-stubs-0.3";
      builder = ./builder.sh;
      src = fetchurl {
        url = http://xcb.freedesktop.org/dist/libpthread-stubs-0.3.tar.bz2;
        sha256 = "16bjv3in19l84hbri41iayvvg4ls9gv1ma0x0qlbmwy67i7dbdim";
      };
      nativeBuildInputs = [ ];
  
negative.code:     name = "xcb-util-0.4.0";
      builder = ./builder.sh;
      src = fetchurl {
        url = mirror://xorg/individual/xcb/xcb-util-0.4.0.tar.bz2;
        sha256 = "1sahmrgbpyki4bb72hxym0zvxwnycmswsxiisgqlln9vrdlr9r26";
      };
      nativeBuildInputs = [ gperf m4 xproto ];
  