Maybe line 414 is the problem. It appears to be the intended replacement but it executes a shell command beginning ln -shF. On my machine that results in

      ln: invalid option -- 'h'

@nuss does it work for you if you fix up than ln command, e.g. by removing the h?

@timblechmann, could you please check if you intended to add a different flag? Maybe the h was meant to be something else.

Ah no my mistake - I was reading too quickly - @timblechmann did not add that line, it's presumably OK when executed on Mac.

It looks reasonable to reinstate that chunk of code, since I can't see any other part of the new code that tries to do its job. Though maybe there's some incomplete re-implementation to consider. Sorry to be so confused - I can't quite infer the intentions from the cmake code.

compare #1175

works here, thanks

here too. Help is available again ;)