virtual/udev problem with emerge

Hi, i'm using systemd without virtual/udev installed, but when i try
to update system an error message blocks emerge:

emerge: there are no ebuilds built with USE flags to satisfy
">=virtual/udev-208[gudev]".
!!! One of the following packages is required to complete your request:
- virtual/udev-215::gentoo (Missing IUSE: gudev)
(dependency required by "sys-fs/udisks-2.1.3::gentoo" [installed])
(dependency required by "gnome-base/gvfs-1.22.3::gentoo[udisks]"
[installed])
(dependency required by "media-sound/sound-juicer-3.14.0::gentoo"
[ebuild])
(dependency required by
"gnome-base/gnome-extra-apps-3.14.0-r1::gentoo" [ebuild])
(dependency required by "gnome-base/gnome-3.12.0::gentoo" [installed])
(dependency required by "@selected" [set])
(dependency required by "@world" [argument])