Error beim installieren von Firefox

Wenn ich Firefox aus den Ports installieren will bricht der Vorgang ab und da steht am Ende:

===> Installing for glib-2.6.3_1
===> glib-2.6.3_1 depends on file: /usr/local/bin/perl5.8.6 - found
===> glib-2.6.3_1 depends on executable: pkg-config - found
===> Generating temporary packing list
===> Checking if devel/glib20 already installed
===> An older version of devel/glib20 is already installed (glib-2.4.8)
You may wish to ``make deinstall'' and install this port again
by ``make reinstall'' to upgrade it properly.
If you really wish to overwrite the old port of devel/glib20
without deleting it first, set the variable "FORCE_PKG_REGISTER"
in your environment or the "make install" command line.
*** Error code 1

Stop in /usr/ports/devel/glib20.
*** Error code 1

Stop in /usr/ports/www/firefox.
! www/firefox (new compiler error)
---> Packages processed: 0 done, 0 ignored, 0 skipped and 1 failed

Was muss ich machen dass es geht?
 
auch wenns lange dauert, ich hab ein portupgrade -aRf laufen alssen und schon gabs keine probleme mehr
 
Noch ein Problem: Wenn ich QT installiere bricht es auch ab. Ich habe die Ausgabe in eine Datei geschrieben: tuxthekiller.tu.funpic.de/err
 
Da fehlt noch etwas :
kernel/qrichtext.cpp: In member function 'void QTextCursor::indent()'
kernel/qrichtext.cpp:1274: internal compiler error: Segmentation fault
 
Code:
,----[ less -p "20050312" /usr/ports/UPDATING ]
|
| 20050312:
|   AFFECTS: all users who have glib/gtk/gnome libraries installed
|   AUTHOR: [email]ahze@FreeBSD.org[/email] and the FreeBSD gnome team
|
|   Gnome has been upgraded to 2.10 and gtk/glib to 2.6.
|   DO NOT USE portupgrade(1) to update any gnome or gtk
|   or any port that depends on them. Using portupgrade
|   will cause problems and you will have to manually
|   upgrade ports.  Please use the gnome_upgrade.sh
|   script from
|     [url]http://www.FreeBSD.org/gnome/gnome_upgrade.sh[/url]
|
`----
 
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