anchor.diff:      if stdenv.system == "i686-linux" then
         fetchurl {
           url = "http://us.download.nvidia.com/XFree86/Linux-x86/${versionNumber}/NVIDIA-Linux-x86-${versionNumber}-pkg0.run";
  -        sha256 = "090rkl1psmcsx3mxb6lnirqipka8vp78y2j7pzqyzl592qpscmg8";
  +        sha256 = "16kjxj2bn78cgyb4xq39zajjv1hx1z5dw50n9r17w14ifq7i09id";
         }
       else if stdenv.system == "x86_64-linux" then
         fetchurl {
           url = "http://us.download.nvidia.com/XFree86/Linux-x86_64/${versionNumber}/NVIDIA-Linux-x86_64-${versionNumber}-pkg0.run";
  -        sha256 = "0hs4fd61iha7b2936wj5w5fj3rxmw60jnkgf6l1pl3va7sfw30d2";
  +        sha256 = "0mk7pj7in090dx2v5yzkd7qkaf0qvz3jv4cmpiflpmzmg9p15x8n";
         }
       else throw "nvidia-x11 does not support platform ${stdenv.system}";
   
  
positive.code: 
    cudaPath = stdenv.lib.makeLibraryPath [zlib stdenv.gcc.gcc];
  
    programPath = stdenv.lib.makeLibraryPath [ gtk atk pango glib xlibs.libXv ];
  
    meta = {
      homepage = http://www.nvidia.com/object/unix.html;
  
negative.code: {stdenv, fetchurl, kernel, xlibs, zlib, gtk, atk, pango, glib, gdk_pixbuf}:
  
  let 
  
    versionNumber = "173.14.35";
  
  in
  
  