initdb failing - core dump

running initdb gives the following:

====================================================
/usr/ports/databases/postgresql7>su -l pgsql -c initdb
The files belonging to this database system will be owned by user "pgsql".
This user must also own the server process.

creating directory /usr/local/pgsql/data... ok
creating directory /usr/local/pgsql/data/base... ok
creating directory /usr/local/pgsql/data/global... ok
creating directory /usr/local/pgsql/data/pg_xlog... ok
creating directory /usr/local/pgsql/data/pg_clog... ok
creating template1 database in /usr/local/pgsql/data/base/1... Bad system
call - core dumped

initdb failed.
Removing /usr/local/pgsql/data.
====================================================

any ideas where the problem might lie?

Thank you all.

====================================================

>uname -a
FreeBSD mangomail.unitedglobaltrading.com 4.5-RELEASE FreeBSD 4.5-RELEASE
#0: Thu Apr 25 17:12:02 PDT 2002
root(at)(dot)unitedglobaltrading(dot)com:/usr/src/sys/compile/MANGOMAIL i386

postgresql-7.2.1_1