If you have xfce4 components (for example the panel) and Mozilla Firefox 1.5 installed at the same time, you get problems. Mozilla Firefox needs GTK+-2.8.x. The xfce4 panel is incompatible with gtk+ 2.8, so the ebuild wants to get gtk+ 2.6. Reproducible: Always Steps to Reproduce: 1. emerge =mozilla-firefox-1.5 2. emerge xfce4-panel 3. emerge -uDNt world Actual Results: emerge wanted to merge gtk+ 2.8 and downgrade to version 2.6 at the same time. Expected Results: It should only upgrade to gtk 2.8.
Mozilla 1.5 isn't marked stable so this is absolutely fine. There's no way to assure every ebuild is compatible with the other.