anchor.diff:    xsd = dontCheck super.xsd;
     zip-archive = dontCheck super.zip-archive;  # https://github.com/jgm/zip-archive/issues/57
   
  -  random_1_2_0 = super.random_1_2_0.override ({ splitmix = self.splitmix_0_1_0_3; });
     # These test suites run for ages, even on a fast machine. This is nuts.
     Random123 = dontCheck super.Random123;
     systemd = dontCheck super.systemd;
  
positive.code:   yesod-core = dontCheck super.yesod-core;
  
    # Add ApplicationServices on darwin
    # use 0.4.5 instead of 0.4.4 to fix build with glibc >= 2.32
    apecs-physics = addPkgconfigDepends super.apecs-physics_0_4_5
      (pkgs.lib.optional pkgs.stdenv.isDarwin pkgs.darwin.apple_sdk.frameworks.ApplicationServices);
  
  } // import ./configuration-tensorflow.nix {inherit pkgs haskellLib;} self super
  
negative.code:   # building of the executable has been disabled for ghc < 8.10 in hnix.
    # Generating the completions should be activated again, once we default to
    # ghc 8.10.
    hnix = dontCheck super.hnix;
  
    # Fails for non-obvious reasons while attempting to use doctest.
    search = dontCheck super.search;
  