fb != directfb.
Also, see this warning in evas readme:
--enable-directfb[=static]
this is the direct fb engine that uses direcftb (http://www.directfb.org) on
linux to access the framebuffer with (or maybe without) acceleration. for
people making set-top boxes or just wanting an alternative to X this is
really good. it may also be useful for embedded devices supported by
directfb that offer acceleration (otherwise the fb driver will likely be
faster). as such this engine is in relative disrepair and is not
maintained. use with great care.
http://trac.enlightenment.org/e/browser/trunk/evas/READMEThe way I read it is that it's for the normal fb, not the directfb backend.