Explicitly set system default for $PATH to

ensure we have a clean build environment (OSX installer)

Mac/BuildScript/build-installer.py

@@ -436,6 +436,9 @@ def checkEnvironment():
                                                     ev, os.environ[ev])
                 del os.environ[ev]
 
+    os.environ['PATH'] = '/bin:/sbin:/usr/bin:/usr/sbin'
+    print "Setting default PATH: %s"%(os.environ['PATH'])
+
 
 def parseOptions(args=None):
     """