I hope you and other people who want to install bgi2grx under Linux, find these hints somehow usefull.
i think you've wasted a bit of time for me, but it really made things much clearer for me. now, i missed the bcc2grx... just downloaded bgi2grx as a pascal unit but never got bcc2grx.
now i think i'll get everything to work.
- finally linux version for NNibbles should work... ;)