anchor.diff:    src =
       if stdenv.system == "x86_64-linux" then
         fetchurl {
  -        url = http://developer.download.nvidia.com/compute/cuda/4_2/rel/toolkit/cudatoolkit_4.2.9_linux_64_suse11.2.run;
  -        sha256 = "1inngzwq520bhpdfrh5bm4cxfyf3hxj94jialjxgviri5bj9hz60";
  +        url = http://developer.download.nvidia.com/compute/cuda/5_5/rel/installers/cuda_5.5.22_linux_64.run;
  +        sha256 = "b997e1dbe95704e0e806e0cedc5fd370a385351fef565c7bae0917baf3a29aa4";
         }
       else throw "cudatoolkit does not support platform ${stdenv.system}";
   
  
positive.code: } :
  
  stdenv.mkDerivation rec {
    name = "cudatoolkit-4.2.9";
  
    dontPatchELF = true;
    dontStrip = true;
  
negative.code:       --set-interpreter "$(cat $NIX_GCC/nix-support/dynamic-linker)" \
        '{}' \; || true
      find . -type f -exec patchelf \
        --set-rpath $rpath:$out/lib:$out/lib64::$out/nvvm/lib:$out/nvvm/lib64:$(cat $NIX_GCC/nix-support/orig-gcc)/lib \
        --force-rpath \
        '{}' \; || true
    '';
  