Resolve a build error that recently became apparent where this
software attempts to define their own function log() that is reserved
for the natural logartihm one, by renaming the private function to
I wonder whether anybody is still using this at all, the respective
service (called `Btx' here) has been cancelled in Germany a couple of
years ago. Any other European countries perhaps? I consider deleting
the port some day. By now, it was easy enough to fix though. Speak
up if you want to see this port continued.