[Exim] Lock file location

Hi,

I've just installed exim. For some reason it tries to put lock files in
/etc rather than /var/spool/mail

exim-base-4.31-0_16.rh9
exim-4.31-0_16.rh9

I get the following in /var/log/exim/main.log

2004-04-11 17:43:22 1BCh7C-000251-Ms <= morten@???
H=cicero2.cybercity.dk [212.242.40.53] P=esmtp S=939
id=40795802.5090001@???
2004-04-11 17:43:22 1BCh7C-000251-Ms == /etc/aliases
<morten@???> R=system_aliases T=address_file defer (13):
Permission denied: creating lock file hitching post
/etc/aliases.lock.mail.primdahl.name.4079679a.00001f42 (euid=93 egid=93)

Any ideas? I have modified the config file to have a hardcoded location
of the aliases file:

# data = ${lookup{$local_part}lsearch{SYSTEM_ALIASES_FILE}}

system_aliases:
driver = redirect
allow_fail
allow_defer
data = /etc/aliases
file_transport = address_file
pipe_transport = address_pipe

Could this cause exim to write lock files in /etc rather than
/var/spool/mail?

Thanks in advance.

Morten