description says it all. Patch to follow
Created attachment 259482 [details, diff] update ebuild with new useflag for tee I need this soon as possible to continue development of firefox-4 please
Created attachment 259483 [details, diff] cairo-1.10.2-update-tee-v1.1 Tee does require the X useflag being enabled from what little bit of digging I have done so modified for such case.
Tee surface is a very small and simple one, it seems. So depending on how stable it is, I'd suggest just always enabling it - a USE flag seems useless. Though I don't maintain cairo, neither does x11 primarily, reassigning
Fixed in main tree.