emerge -Dva gimp
These are the packages that would be merged, in order:
Calculating dependencies... done!
The following keyword changes are necessary to proceed:
(see "package.accept_keywords" in the portage(5) man page for more details)
# required by gimp (argument)
NOTE: The --autounmask-keep-masks option will prevent emerge
from creating package.unmask or ** keyword changes.
Would you like to add these changes to your config files? [Yes/No] No
* In order to avoid wasting time, backtracking has terminated early
* due to the above autounmask change(s). The --autounmask-backtrack=y
* option can be used to force further backtracking, but there is no
* guarantee that it will produce a solution.
emerge: there are no ebuilds to satisfy ">=media-libs/gegl-0.4.14:0.4[cairo]".
(dependency required by "media-gfx/gimp-9999::media-kit" [ebuild])
(dependency required by "gimp" [argument])