Log Message:
Update to 3.1.1
Fixed --version flag in dhcrelay
Clarified error message when lease limit exceeded
Log messages when failover peer names mismatch have been improved to point out \ 
the problem.
Manpage entries in dhcp-options.5 for the 'domain-list' format have been updated.
The 'min-secs' configuration parameter's log message has been updated to be more \ 
helpful.
Fixes to allow code to compile on Mac OS X Leopard (10.5).

See http://www.isc.org/sw/dhcp/dhcp_rel2.php for all the details