Markus and Luca,
the problem is in g.gisenv (main.c) where you must change
printf() to fprintf().BTW, these printf() should be changed in all grass commands.
Thank you for the hint! I will change all printf for the next
GRASS 5 beta release. They also cause some problems in GRASS
4.2.1, it seems. I already converted the imagery-tree but will
continue with all modules. This shall be fixed in GRASS 5 beta4.
Best regards
Markus