Build of firefox from ports does not finish

[Robert Simmons]

It ends with the following:

gmake[5]: Leaving directory
`/usr/ports/www/firefox/work/mozilla-release/browser/app/profile/extensions'
gmake[4]: Leaving directory
`/usr/ports/www/firefox/work/mozilla-release/browser/app'
gmake[3]: Leaving directory
`/usr/ports/www/firefox/work/mozilla-release/browser'
gmake[2]: Leaving directory `/usr/ports/www/firefox/work/mozilla-release'
gmake[1]: Leaving directory `/usr/ports/www/firefox/work/mozilla-release'
if test -d ./dist/bin ; then touch ./dist/bin/.purgecaches ; fi
hg: not found
sed: /usr/ports/www/firefox/work/mozilla-release/build/unix/*.pc: No
such file or directory

Any ideas as to what is causing this?