Kyle Bateman <kyle@actarg.com> writes:
> Is this a regression or is there a reason the clock command is no longer
> accessible?
And the answer is ... it's an underdocumented implementation change
in Tcl's "clock" command. You can find the explanation and patch at
http://archives.postgresql.org/pgsql-committers/2010-01/msg00369.php
Or, if you just need a quick workaround, use pltclu.
regards, tom lane