pga_next_schedule function bug

When creating a schedule or running the test code in pgagent.sql the
following occurs:
ERROR: syntax error at or near "IF"
CONTEXT: compile of PL/pgSQL function "pga_next_schedule" near line 161
PL/pgSQL function "pga_job_trigger" line 4 at select into variables
PL/pgSQL function "pga_schedule_trigger" line 10 at SQL statement

This can be fixed by editing the pga_next_schedule function around lines
131-163; the problem is that there is no ELSEIF keyword in the language. The
correct syntax is ELSIF.

Here's a corrected version of the block of code that is causing problems:
-- Was the last day flag selected?
IF nextday = 32 THEN
IF nextmonth = 1 THEN
nextday := 31;
ELSIF nextmonth = 2 THEN
IF pgagent.pga_is_leap_year(nextyear) = TRUE THEN
nextday := 29;
ELSE
nextday := 28;
END IF;
ELSIF nextmonth = 3 THEN
nextday := 31;
ELSIF nextmonth = 4 THEN
nextday := 30;
ELSIF nextmonth = 5 THEN
nextday := 31;
ELSIF nextmonth = 6 THEN
nextday := 30;
ELSIF nextmonth = 7 THEN
nextday := 31;
ELSIF nextmonth = 8 THEN
nextday := 31;
ELSIF nextmonth = 9 THEN
nextday := 30;
ELSIF nextmonth = 10 THEN
nextday := 31;
ELSIF nextmonth = 11 THEN
nextday := 30;
ELSIF nextmonth = 12 THEN
nextday := 31;
ELSE
--do nothing
END IF;
END IF;