The Darwin installer currently tries to call out to osascript to create a login item to start the Deadline launcher.
Aside from not being able to disable this auto-start registration behavior (addressed in a separate thread), this process will fail if the installer is run in unattended mode in a non-GUI session on a machine with no GUI sessions active (e.g. on a render node by a software deployment system, over SSH, etc.)
It results in the following error (in addition to exiting with a non-zero exit status):
_RegisterApplication(), FAILED TO establish the default connection to the WindowServer, _CGSDefaultConnection() is NULL.It seems this issue does not affect Snow Leopard, but it does affect Mavericks.