@FRidh It was that easy :-o And it works with my example use case (layers of overrides due to separation of concerns).

Thanks!

In general, is there any reason to use any other override method than overridePythonAttrs with buildPythonPackage created derivations? And is there known dangers from overusing that? (Beyond possibly slowing down the initial evaluation?)

@datakurre buildPythonPackage does some logic before it passes its results to stdenv.mkDerivation. When you use overrideAttrs or overrideDerivation that logic isn't re-executed when you do the overriding.