Problem building maildrop with exim as MTA

[Jim Trigg]

When I try to build maildrop after installing exim as my primary mta I 
get the following error:

checking location of system mailboxes... configure: error: Cannot 
determine default mailbox
configure: error: ./configure failed for libs/maildrop
===>  Script "configure" failed unexpectedly.
Please report the problem to madpilot at FreeBSD.org [maintainer] and 
attach the
"/usr/ports/mail/maildrop/work/maildrop-2.8.2/config.log" including the 
output
of the failure of your make command. Also, it might be a good idea to 
provide
an overview of all packages installed on your system (e.g. a
/usr/local/sbin/pkg-static info -g -Ea).
*** Error code 1

Any suggestions as to how to fix this? I'm attempting to migrate from 
one host running Postfix to a new host running Exim but want to continue 
my maildrop support. (The switch is an attempt to reduce backscatter by 
doing more antispam during the SMTP session rather than after message 
acceptance.)

Thanks,
Jim Trigg