> Used make is 'GNU Make v4.4.90' from git repo whose head is commit e3f938, > and I'm working on OS/2. > > v4.4.1 works fine.
In lack of OS/2 maintainer the official GNU Make dropped support for OS/2 somewhere around version 4.4. It seems as if some unofficial fork was done at https://github.com/komh/make-os2 but that fork does not seem to have put the effort in to follow continued work with GNU Make. regards Henrik