can't install firefox

gmake: *** [libgiofam.la] Error 1 *** Error code 2 
Stop in /usr/ports/devel/gio-fam-backend. *** Error code 1 
Stop in /usr/ports/net/avahi-app. *** Error code 1 
Stop in /usr/ports/devel/gnome-vfs. *** Error code 1 
Stop in /usr/ports/www/firefox3. *** E

Solution:
#cd /usr/ports/devel/glib20/
#make install

#cd /usr/ports/www/firefox3/
#make install