emerge: there are no ebuilds built with USE flags to satisfy ">=app-crypt/gcr-3.5.3:=[gtk]".
!!! One of the following packages is required to complete your request:

• app-crypt/gcr-3.6.2::gentoo (Missing IUSE: gtk)
  (dependency required by "gnome-base/gnome-keyring-3.10.1" [ebuild])
  (dependency required by "app-crypt/libsecret-0.15-r1" [ebuild])
  (dependency required by "gnome-base/gvfs-1.14.2[gnome-keyring]" [ebuild])
  (dependency required by "gnome-base/gnome-light-3.6.2" [ebuild])
  (dependency required by "gnome-light" [argument])