anchor.diff:  
     ## Needs bump to a versioned attribute
     ## Issue: https://github.com/sol/doctest/issues/189
  -  doctest = dontCheck super.doctest_0_14_1; # test suite fails in Nix
  +  doctest = overrideCabal super.doctest_0_14_1 (drv: {
  +    ## Setup: Encountered missing dependencies:
  +    ## ghc >=7.0 && <8.4
  +    ##
  +    ##        uncaught exception: IOException of type NoSuchThing (test/integration/testImport: changeWorkingDirectory: does not exist (No such file or directory))
  +    doCheck         = false;
  +  });
   
     ## Needs bump to a versioned attribute
     ##     • Could not deduce (Semigroup (IterT m a))
  
positive.code:   ## Upstreamed
  
    ## Upstreamed, awaiting a Hackage release
    haskell-gi = overrideCabal super.haskell-gi (drv: {
      ## Setup: Encountered missing dependencies:
      ## haskell-gi-base ==0.20.*
  
negative.code:     doCheck         = false;
      ## Setup: Encountered missing dependencies:
      ## data-or ==1.0.*
      libraryHaskellDepends = drv.libraryHaskellDepends ++ (with self; [ data-or ]);
    });
  
    ## Unmerged.  PR: https://github.com/gtk2hs/gtk2hs/pull/233
  