I wonder if TIME_IS_FAST is being defined as 1 in any of these Linux or BSD builds.
I just found that the current OpenBSD release (5.6) has TIME_IS_FAST = 0. Details are in a ticket comment I just posted.
Libertas, can you search your tor binary or tor debug symbols for the function "approx_time"?
approx_time did indeed show up on the Tor 0.2.5.10 build on my OpenBSD 5.6 relay.