Checking integrity... done (2 conflicting) when installing x11-wm/xfce4

[Otacílio]

Dears

When I try install x11-wm/xfce4 on a FreeBSD11-ALPHA3 machine I get this 
error message:

root at squitch:/usr/home/ota # pkg install x11-wm/xfce4
Updating FreeBSD repository catalogue...
FreeBSD repository is up-to-date.
All repositories are up-to-date.
Checking integrity... done (2 conflicting)
Cannot solve problem using SAT solver, trying another plan
Checking integrity... done (0 conflicting)
The most recent version of packages are already installed


Some can give me  a hint about how to solve it?


Thanks a lot

[]'s

-Otacílio