Ok. My bad. When I had run "apt-get install bluez-utils gnokii" it
automatically brought in libbluetooth1. Alas, it did NOT bring in
libbluetooth1-dev. When I ran ./configure for gnokii-0.6.14, it could
not find the bluetooth header files, so it disabled the bluetooth_open()
function in common/devices/unixbluetooth.c. (I used GDB to determine
that bluetooth_open() had been #define'd to be "{ return -1 }".) Once I
ran apt-get to pull in the libbluetooth1-dev package and
re-ran ./configure, recompiled and re-installed, then all was well.