Can't upgrade firefox

[Andrea Venturoli]

Hello.
I'm on a 8.1p2/i386.

Issuing "portupgrade -o www/firefox www/firefox35", compilation ends 
with the following:

 > ...
> gmake[3]: Nothing to be done for `tools'.
> gmake[3]: Leaving directory `/usr/local/local/storage/alamartmp/usr/ports/www/firefox/work/mozil
> la-2.0/obj-i386-unknown-freebsd8.1/browser/installer'
> if test -d ../../dist/bin ; then touch ../../dist/bin/.purgecaches ; fi
> hg: not found
> gmake[2]: Leaving directory `/usr/local/local/storage/alamartmp/usr/ports/www/firefox/work/mozil
> la-2.0/obj-i386-unknown-freebsd8.1/browser/installer'
> gmake[1]: Leaving directory `/usr/local/local/storage/alamartmp/usr/ports/www/firefox/work/mozil                                                                                                    la-2.0/obj-i386-unknown-freebsd8.1'
> OBJDIR=obj-i386-unknown-freebsd8.1 /usr/local/bin/python2.7 obj-i386-unknown-freebsd8.1/_profile                                                                                                    /pgo/profileserver.py
> Traceback (most recent call last):
>   File "obj-i386-unknown-freebsd8.1/_profile/pgo/profileserver.py", line 52, in <module>
>     from automation import Automation
>   File "/usr/local/local/storage/alamartmp/usr/ports/www/firefox/work/mozilla-2.0/obj-i386-unkno                                                                                                    wn-freebsd8.1/_profile/pgo/automation.py", line 16, in <module>
>     import sqlite3
>   File "/usr/local/lib/python2.7/sqlite3/__init__.py", line 24, in <module>
>     from dbapi2 import *
>   File "/usr/local/lib/python2.7/sqlite3/dbapi2.py", line 27, in <module>
>     from _sqlite3 import *
> ImportError: /usr/local/lib/python2.7/site-packages/_sqlite3.so: Undefined symbol "sqlite3_load_                                                                                                    extension"
> gmake: *** [profiledbuild] Error 1
> *** Error code 1

I've banged my head on this, but can't get to understand.
I already tried deleting py27-sqlite, reinstalling it with 'portupgrade 
-Rf' and so on.

Any help is appreciated.



  bye & Thanks
	av.