anchor.diff:          sha256 = "1kx6l4yzsamk6q1f4vllcpywhbfr2j5wfl4h5zx8v6dgfpsjm2lw";
         })
       ];
  -    gcc = gcc6;
  +    gcc = gcc7;
     };
   
     cudatoolkit_9 = cudatoolkit_9_2;
  
positive.code: { lib, stdenv, makeWrapper, fetchurl, requireFile, perl, ncurses, expat, python27, zlib
  , gcc48, gcc49, gcc5, gcc6
  , xorg, gtk2, glib, fontconfig, freetype, unixODBC, alsaLib, glibc
  }:
  
  
negative.code:     url = "https://developer.nvidia.com/compute/cuda/10.0/Prod/local_installers/cuda_10.0.130_410.48_linux";
      sha256 = "16p3bv1lwmyqpxil8r951h385sy9asc578afrc7lssa68c71ydcj";
  
      gcc = gcc7;
    };
  
    cudatoolkit_10 = cudatoolkit_10_0;
  