[Tilecache] Another missing dependency?

[Scot Wilcoxon]

Does this mean there is another undeclared dependency?

  File "/var/lib/python-support/python2.5/TileCache/Caches/Disk.py", line
96, in attemptLock
    warnings.warn("removing stale lock %s" % name)
NameError: global name 'warnings' is not defined