anchor.diff: -{ stdenv, bazel_4, buildBazelPackage, isPy3k, lib, fetchFromGitHub, symlinkJoin
  +{ stdenv, bazel_5, buildBazelPackage, isPy3k, lib, fetchFromGitHub, symlinkJoin
   , addOpenGLRunpath, fetchpatch, patchelfUnstable
   # Python deps
   , buildPythonPackage, pythonOlder, python
  
positive.code:     fetchAttrs = {
        # cudaSupport causes fetch of ncclArchive, resulting in different hashes
        sha256 = if cudaSupport then
          "sha256-mcK60pLz70tOAu1+THUXweiO2SCSFUdFdT91HaUokzA="
        else
          if stdenv.isDarwin then
            "sha256-j2k9Q+k41nq5nP1VjjkkNjXRov1uAda4RCMDMAthjrk="
          else
            "sha256-teW6o9Fb4hUxmaHpQU2F+5ihE/DA+MIY8QaMEKMnFiE=";
      };
  
      buildAttrs = {
  
negative.code: 
    tfFeature = x: if x then "1" else "0";
  
    version = "2.10.0-rc0";
    variant = if cudaSupport then "-gpu" else "";
    pname = "tensorflow${variant}";
  
  