/usr/ports/x11/gnomesession を make したらエラーになり、

Please run the gnomelogalyzer, available from "http://www.freebsd.org/gnome/gnomelogalyzer.sh", which will diagnose the problem and suggest a solution.
If - and only if - the gnomelogalyzer cannot solve the problem, report the build failure to the FreeBSD GNOME team at gnome@FreeBSD.org, and attach (a)

と出たので、 gnomelogalyzer.sh を実行したら

One or more GNOME libraries are too out-of-date.

To correct this problem, make sure that sysutils/portupgrade is installed, and then upgrade all out-of-date ports with the command "portupgrade -a".

と出たので、 portupgrade -a を実行したら

Stale dependency: gconf2-2.12.1 --> gtk-2.8.7_2 -- manually run 'pkgdb -F' to fix, or specify -O to force.

とmsgが出たので、pkgdb -F を実行したところ

---> Checking the package registry database
Stale dependency: gconf2-2.12.1 -> gtk-2.8.7_2 (x11-toolkits/gtk20):
New dependency? (? to help):

というmsgが出ました。これ何を指定したらいいのでしょう・・・
Enterすると、
Skip this? ([y]es/[n]o/[a]ll) [yes]
と出るのですが、noするとまた
New dependency? (? to help):
と聞いてくるので・・・