gnome2 build failure

[Odhiambo WASHINGTON]

spamfilter# uname -vm
FreeBSD 6.3-PRERELEASE #2: Thu Nov  1 18:20:27 EAT 2007
root at spamfilter:/usr/obj/usr/src/sys/VMWARE  i386

# cd /usr/ports/x11/gnome2
# make all install clean
<snip>
gmake[3]: Entering directory
`/usr/ports/x11/gnome-desktop/work/gnome-desktop-2.20.1/desktop-docs/gpl'
gmake[3]: Nothing to be done for `all'.
gmake[3]: Leaving directory
`/usr/ports/x11/gnome-desktop/work/gnome-desktop-2.20.1/desktop-docs/gpl'
Making all in lgpl
gmake[3]: Entering directory
`/usr/ports/x11/gnome-desktop/work/gnome-desktop-2.20.1/desktop-docs/lgpl'
if ! test -d ar/; then mkdir ar/; fi
if [ -f "C/lgpl.xml" ]; then d="../"; else
d="/usr/ports/x11/gnome-desktop/work/gnome-desktop-2.20.1/desktop-docs/lgpl/
"; fi; \
        (cd ar/ && \
          `which xml2po` -e -p \
            "${d}ar/ar.po" \
            "${d}C/lgpl.xml" > lgpl.xml.tmp && \
            cp lgpl.xml.tmp lgpl.xml && rm -f lgpl.xml.tmp)
Traceback (most recent call last):
  File "/usr/local/bin/xml2po", line 35, in ?
    import libxml2
ImportError: No module named libxml2
gmake[3]: *** [ar/lgpl.xml] Error 1
gmake[3]: Leaving directory
`/usr/ports/x11/gnome-desktop/work/gnome-desktop-2.20.1/desktop-docs/lgpl'
gmake[2]: *** [all-recursive] Error 1
gmake[2]: Leaving directory
`/usr/ports/x11/gnome-desktop/work/gnome-desktop-2.20.1/desktop-docs'
gmake[1]: *** [all-recursive] Error 1
gmake[1]: Leaving directory
`/usr/ports/x11/gnome-desktop/work/gnome-desktop-2.20.1'
gmake: *** [all] Error 2
*** Error code 2

Stop in /usr/ports/x11/gnome-desktop.
*** Error code 1

Stop in /usr/ports/sysutils/gnome-control-center.
*** Error code 1

Stop in /usr/ports/x11/gnome-applets.
*** Error code 1

Stop in /usr/ports/x11/gnome2.
*** Error code 1

Stop in /usr/ports/x11/gnome2.

PS: I have followed the instructions in /sur/ports/UPDATING and also run
portupgrade -a on this box severally but that doesn't seem to fix the
problem.