Thanks.
Fedora RPMs in the usual place:
https://www.squirrel.nl/pub/MMA/MMA_PLUGPATH seems to work as expected.
mma -I still cannot find local plugins.
Move in main.py the call MMA.options.opts() to after processing the MMA_LIBPATH and MMA_PLUGPATH environment variables?
MMA_LIBPATH seems to work as expected.
mma-gb seems to be designed for a single libPath only, so adding processing of MMA_LIBPATH is not trivial.
mma-gb crashes on [Re-read Grooves] when mma produces unexpected output. For example, a PRINT statement in
.mmarc.