OpenImageIO/oiio — pull request #191 by hobbes1069 (2011-11-06 00:05:45+00:00)
Title: Added USE_EXTERNAL_TBB as cmake option.

Added option to use the system installed TBB library. I used the USE_EXTERNAL_PUGIXML as a template.

It's defaults to OFF and is mutually exclusive to USE_TBB. It would be good to have USE_TBB turned off if USE_EXTERNAL_TBB is enabled but I'm not sure how to do that.