The >=gnome-base/gconf-1.0.4-r2 dependency must be change to something else that doesn't pick the newer gconf of gnome2. Otherwise the building of gnome-vfs-1.0.x fails in the presence of gnome2 libs as doesn't find the gconf-config program. See the http://lists.gentoo.org/pipermail/gentoo-dev/2002-June/012587.html thread for more info.
Following Spider's suggestion I file here other related dependencies problems. Basically the dependencies problems I experienced were related with the packages that should live together in gnome2 but with different versions, i.e.: control-center-1.4.* gconf-1.0.* gnome-vfs-1.0.* I'm not sure if these also cause problems: gtk+-1.2.* libglade-0.* The problems I've noticed was: gnome-vfs-1.0.* should depend on gconf-1.0.* only control-center-1.4.* and balsa-1.2.* should depend on gnome-vfs-1.0.* only gnome-core-* should depend on control-center-1.4.* only but I'm sure there are more. Doing: find /usr/portage -name "*.ebuild" | xargs grep "gnome-vfs-1\.0\." catches all the situations though, and the same can be done for the other packages. I hope this helps.
This was fixed in gconf-1.0.5* time ago. Thanks.