anchor.diff:          # Remove OpenCL libraries as they are provided by ocl-icd and driver.
           rm -f $out/lib64/libOpenCL*
   
  +        # Set compiler for NVCC.
  +        wrapProgram $out/bin/nvcc \
  +          --prefix PATH : ${gcc}/bin
         '' + lib.optionalString (lib.versionOlder version "8.0") ''
           # Hack to fix building against recent Glibc/GCC.
           echo "NIX_CFLAGS_COMPILE+=' -D_FORCE_INLINES'" >> $out/nix-support/setup-hook
         '';
  +
  +      passthru = {
  +        cc = gcc;
  +        majorVersion =
  +          let versionParts = lib.splitString "." version;
  +          in "${lib.elemAt versionParts 0}.${lib.elemAt versionParts 1}";
  +      };
   
         meta = with stdenv.lib; {
           description = "A compiler for NVIDIA GPUs, math libraries, and tools";
  
positive.code:     version = "6.0.37";
      url = "http://developer.download.nvidia.com/compute/cuda/6_0/rel/installers/cuda_6.0.37_linux_64.run";
      sha256 = "991e436c7a6c94ec67cf44204d136adfef87baa3ded270544fa211179779bc40";
    };
  
    cudatoolkit65 = common {
      version = "6.5.19";
      url = "http://developer.download.nvidia.com/compute/cuda/6_5/rel/installers/cuda_6.5.19_linux_64.run";
      sha256 = "1x9zdmk8z784d3d35vr2ak1l4h5v4jfjhpxfi9fl9dvjkcavqyaj";
    };
  
    cudatoolkit7 = common {
      version = "7.0.28";
      url = "http://developer.download.nvidia.com/compute/cuda/7_0/Prod/local_installers/cuda_7.0.28_linux.run";
      sha256 = "1km5hpiimx11jcazg0h3mjzk220klwahs2vfqhjavpds5ff2wafi";
    };
  
    cudatoolkit75 = common {
      version = "7.5.18";
      url = "http://developer.download.nvidia.com/compute/cuda/7.5/Prod/local_installers/cuda_7.5.18_linux.run";
      sha256 = "1v2ylzp34ijyhcxyh5p6i0cwawwbbdhni2l5l4qm21s1cx9ish88";
    };
  
    cudatoolkit8 = common {
      version = "8.0.61";
      url = "https://developer.nvidia.com/compute/cuda/8.0/Prod2/local_installers/cuda_8.0.61_375.26_linux-run";
      sha256 = "1i4xrsqbad283qffvysn88w2pmxzxbbby41lw0j1113z771akv4w";
    };
  
    cudatoolkit9 = common {
      version = "9.0.176";
      url = "https://developer.nvidia.com/compute/cuda/9.0/Prod/local_installers/cuda_9.0.176_384.81_linux-run";
      sha256 = "0308rmmychxfa4inb1ird9bpgfppgr9yrfg1qp0val5azqik91ln";
    };
  
  }
  
negative.code: 
        outputs = [ "out" "lib" "doc" ];
  
        nativeBuildInputs = [ perl makeWrapper ];
  
        runtimeDependencies = [
          ncurses expat python zlib glibc
  