anchor.diff:    '';
   
     installPhase = ''
  -    mkdir $out
  +    mkdir $out $sdk
       perl ./install-linux.pl --prefix="$out"
  +    perl ./install-sdk-linux.pl --prefix="$sdk" --cudaprefix="$out"
     '';
   
     meta = {
  
positive.code:       }
      else throw "cudatoolkit does not support platform ${stdenv.system}";
  
    buildInputs = [ perl ];
  
    runtimeDependencies = [
  
negative.code:     sh $src --keep --noexec
      cd pkg/run_files
      sh cuda-linux64-rel-5.5.22-16488124.run --keep --noexec
      sh cuda-samples-linux-5.5.22-16488124.run --keep --noexec
      cd pkg
    '';
  
  