The Harvest Broker requires some additional installation so that the WWW interface to the Broker will function correctly.
You must edit $HARVEST_HOME/cgi-bin/HarvestGather.cgi if you need to change HARVEST_HOME from the default value
HARVEST_HOME=/files1/stuff/harvest
You may need to edit $HARVEST_HOME/cgi-bin/BrokerQuery.pl.cgi, to change the HARVEST_HOME variable near the top of that file. And if your Perl binary is not /usr/local/bin/perl then you'll need to change the first line of BrokerQuery.pl.cgi as appropriate.