Tested with \t and that works too. Attached is a patch containing these changes and which fixes this (these) bug(s).  — Kind Regards Jostein Kjønigsen > On 5 Mar 2025, at 14:19, Jostein Kjønigsen wrote: > >> From the Makefile format, I think this should not be leading whitespace, but only leading tabs. Leading spaces in rules are a syntax error. Can you check whether \t instead of \s also works? > > > Good catch, Arne. Will check. > >> Looks like the 10th duplicate of Bug#17400. > > > Also good catch, Mauro. Can someone merge these 2 bugs? > > But honestly: A more than 10 year old bug!!! About time we get it fixed! > > I'll report back as soon as I have a new patch! > > — > Kind Regards > Jostein Kjønigsen >