Where's the USE flag for that?!

While building xine, I happened to catch autoconf spewing out:

*** The caca-config program installed by CACA could not be found
*** If CACA was installed in PREFIX, make sure PREFIX/bin is in
*** your path, or use --with-caca-prefix to set the prefix
*** where CACA is installed.
*** All CACA-dependent parts will be disabled ***

I think I'm actually OK with my programs being CACA-free.