Remove PYTHONPATH requirement to execute run_slave.py.

slave/Makefile

 # -*- makefile -*-
 
 # This is a simple makefile which lives in a buildmaster/buildslave
 # directory (next to the buildbot.tac file). It allows you to start/stop the
 # master or slave by doing 'make start' or 'make stop'.
 
-# The 'reconfig' target will tell a buildmaster to reload its config file.
-
-# Note that a relative PYTHONPATH entry is relative to the current directory.
-
 # On the Mac, the buildbot is started via the launchd mechanism as a
 # LaunchAgent to give the slave a proper Mac UI environment for tests.  In
 # order for this to work, the plist must be present and loaded by launchd, and
 # the user must be logged in to the UI.  The plist is loaded by launchd at user
 # login (and the job may have been initially started at that time too).  Our
 # Mac build slaves are all set up this way, and have auto-login enabled, so
 # "make start" should just work and do the right thing.
 #
 # When using launchd to start the job, it also needs to be used to stop the
 # job.  Otherwise, launchd might try to restart the job when stopped manually
 # by SIGTERM.  Using SIGHUP for reconfig is safe with launchd.
 #
 # Because it's possible to have more than one slave on a machine (for testing),
 # this tests to make sure that the slave is in the known slave location,
 # /b/slave, which is what the LaunchAgent operates on.
 USE_LAUNCHD := \
   $(shell [ -f ~/Library/LaunchAgents/org.chromium.buildbot.slave.plist ] && \
           [ "$$(pwd -P)" = "/b/build/slave" ] && \
           echo 1)
 
-export PYTHONPATH=../third_party/buildbot_7_12:../third_party/twisted_8_1
-
 start:
 ifneq ($(USE_LAUNCHD),1)
         python run_slave.py --no_save -y buildbot.tac
 else
         launchctl start org.chromium.buildbot.slave
 endif
 
 stop:
 ifneq ($(USE_LAUNCHD),1)
         if `test -f twistd.pid`; then kill `cat twistd.pid`; fi;
 else
         launchctl stop org.chromium.buildbot.slave
 endif
 
 reconfig:
         kill -HUP `cat twistd.pid`
 
 log:
         tail -F twistd.log
 
 wait:
         while `test -f twistd.pid`; do sleep 1; done;
 
 restart: stop wait start log