anchor.diff:    version = "1.1.0";
     name = "${pname}-${version}";
     format = "wheel";
  -  disabled = ! (isPy35 || isPy27);
  +  disabled = ! (isPy36 || isPy35 || isPy27);
   
     src = let
         tfurl = sys: proc: pykind:
  
positive.code:             url = tfurl "linux" "cpu" "cp27-none-linux_x86_64";
              sha256 = "0ld3hqx3idxk0zcrvn3p9yqnmx09zsj3mw66jlfw6fkv5hznx8j2";
            };
            py3 = {
              url = tfurl "linux" "cpu" "cp35-cp35m-linux_x86_64";
              sha256 = "0ahz9222rzqrk43lb9w4m351klkm6mlnnvw8xfqip28vbmymw90b";
            };
          };
          linux-x86_64.cuda = {
            py2 = {
              url = tfurl "linux" "gpu" "cp27-none-linux_x86_64";
              sha256 = "1baa9jwr6f8f62dyx6isbw8yyrd0pi1dz1srjblfqsyk1x3pnfvh";
            };
            py3 = {
              url = tfurl "linux" "gpu" "cp35-cp35m-linux_x86_64";
              sha256 = "0606m2awy0ifhniy8lsyhd0xc388dgrwksn87989xlgy90wpxi92";
            };
          };
        };
      in
      fetchurl (
        if stdenv.isDarwin then
          if isPy35 then
            dls.darwin.cpu.py3
          else
            dls.darwin.cpu.py2
        else if isPy35 then
          if cudaSupport then
            dls.linux-x86_64.cuda.py3
          else dls.linux-x86_64.cpu.py3
        else
          if cudaSupport then
            dls.linux-x86_64.cuda.py2
  
negative.code: { stdenv
  , fetchurl
  , buildPythonPackage
  , isPy36, isPy35, isPy27
  , cudaSupport ? false
  , cudatoolkit ? null
  , cudnn ? null
  