I added footprint TO220 for 7815 that has 3 pins and it says
Checking: /usr/share/gEDA/sym/linear/lm7815-1.sym Warning: Number of pins does not match footprint size. 1 warnings found No errors found
Well as the footprint name is TO220 gsymcheck asumes that there should be 220 pins.
Well that would certainly be an interesting voltage regulator.
This rule works fine for the most of the footprints like DIP14, SO20, QFP44, but fails on TO92, ...
-Dave