I too fell victim to the GNU trap and thought "?=" was standard and actually useful.
> and want to "dynamically" override it (e.g. in a build system context) > when the environment already specifies PREFIX, you either do > > make -e Completely forgot about the -e flag. Now I need to go update all my projects and who knows what other GNU-isms I'm unknowingly using. > that is exactly what I meant earlier on that the POSIX-intended good > practices get destroyed by the retarded GNU extensions. Yeah you make a strong argument. I too think a linting tool would be useful. I imagine it would function like shellcheck does for shells. If nothing else it would really help people identify GNU extensions vs portable behavior.
