You have what is commonly referred to by the OpenBSD Project as a "Frankensystem," named after the mad scientist in Mary Shelley's "Frankenstein." Frankenstein's monster was created from parts of several people.
Take a look at the difference between the
/etc/rc.conf for 4.1 and the same file for 5.3. You can
click here for a color-coded "graphical" comparison, or
click here for a Unified diff(1) comparison.