Yes, this helped! Many many thanks to Sebastian!!

Regards

Roland

Am Mittwoch, den 25.11.2020, 10:40 +0100 schrieb Sebastian Graf:

Oh, nevermind. See the comments on https://gitlab.haskell.org/ghc/ghc/-/commit/fc644b1a643128041cfec25db84e417851e28bab. Apparently, master really is broken in devel2 flavour!