It looks as if the detection from the command line succeeds (as root?) but from cups...
Remove old superfluous fax-monitor.[ch]
Code cleanups and added some error handling. No...
Added fax-recipient option
Changed naming of ppd to match filtername
Added missing fax-runloop.h
Renamed filter fron canonf-fax to bjnp-fax
Refactored some code out into own functions