From CDOT Wiki
This section explains some
usefull environment variables that you can use.
Distcc has a few environment variables. The most useful are listed here, which are all set on the master computer. The master machine is the machine in which the mozilla directory is located.
<dd>the ip addresses of the slave machines. Usually localhost is the first host. '''THIS IS REQUIRED'''
''Example :'' export DISTCC_CL_HOSTS="localhost 10.0.0.2 10.0.0.4
Values : 1 for allow fallback