Build of GHC 9.6 fails when the build directory is not a child of the source directory

[Viktor Dukhovni]

On Sun, Apr 30, 2023 at 11:18:07AM +0200, Torsten Schmits via ghc-devs wrote:

> I created an issue for this: 
> https://gitlab.haskell.org/ghc/ghc/-/issues/22741
> 
> You can share your insights there!

Done.  It does look like we encountered the same underlying issue..

-- 
    Viktor.