Many thanks for all the suggestions.
Since NEEDEDFLAG can also be set by:
nim c -d:NEEDEDFLAG etc.etc.
Run
I need to use defined(NEEDEDFLAG) instead of declared(NEEDEDFLAG).
However the following inside nim.cfg worked for me:
@if BGMAP:
define:BGDUMP
@end
Run
which is the actual example in use.
Where (URL) are the @ commands for nim.cfg documented?? I could not find them
in [https://nim-lang.org/docs/nimc.html](https://nim-lang.org/docs/nimc.html)
