www/mozilla-devel: WITH_CALENDAR=true is broken

[Mikhail Teterin]

Port last updated today...

[...]
+++ updating chrome ../dist/bin/chrome/installed-chrome.txt
+++     
locale,install,url,jar:resource:/chrome/US.jar!/locale/US/messenger-region/
+++ overriding locale/US/messenger-region/contents.rdf 
updating: locale/US/messenger-region/contents.rdf (stored 0%)
gmake[2]: Leaving directory 
`/usr/ports/www/mozilla-devel/work/mozilla/mailnews'
gmake[1]: Leaving directory `/usr/ports/www/mozilla-devel/work/mozilla'
/opt/bin/gmake tier_98
gmake[1]: Entering directory `/usr/ports/www/mozilla-devel/work/mozilla'
tier_98: calendar
gmake[2]: Entering directory 
`/usr/ports/www/mozilla-devel/work/mozilla/calendar'
gmake[2]: *** No rule to make target `export'.  Stop.
gmake[2]: Leaving directory 
`/usr/ports/www/mozilla-devel/work/mozilla/calendar'
gmake[1]: *** [tier_98] Error 2
gmake[1]: Leaving directory `/usr/ports/www/mozilla-devel/work/mozilla'
gmake: *** [default] Error 2
*** Error code 2

Stop in /usr/ports/www/mozilla-devel.

	-mi