Needed for MATE 1.6 stabilization, a dependency of mate-base/mate-control-center.
Hmm, I notice there is already a --disable-appindicator in the ebuild; but I guess I had to add the dependency due to a later check, need to double check it.
Not going to play a p.u.s.m. game here; either we stabilize it, or we don't. + 02 May 2014; Tom Wijsman <TomWij@gentoo.org> mate-control-center-1.6.2.ebuild, + mate-control-center-1.8.1.ebuild: + Remove libappindicator dependency, fixes bug #509278; restrict mate-desktop + dependency to 1.6 for mate-control-center 1.6, due to build failure.