Evolution without gnome

[sebastian ssmoller]

hi,
recently i set up a new freebsd current. i want to use xfce4 as
desktop/window manager but also evolution as mail client. i had a look
at the dependencies of evolution and found out that evolution depends on
the whole gnome2 desktop (!)

can anyone explain me why evolution depends on things like gnome-panel,
gnome-desktop, ..., please? 

is there any way to use evolution without gnome-desktop installed (i
googled a bit but havnt found any useful information yet) ?

thx 
seb