What's wrong here? Can't reinstall graphics/lcms2

[Walter Hurry]

$ sudo portupgrade -f graphics/lcms2
[Reading data from pkg(8) ... - 544 packages found - done]
--->  Reinstalling 'lcms2-2.5' (graphics/lcms2)
--->  Building '/usr/ports/graphics/lcms2'
===>  Cleaning for lcms2-2.5
===>  lcms2-2.5 has known vulnerabilities:
lcms2-2.5 is vulnerable:
lcms2 -- Null Pointer Dereference Denial of Service Vulnerability

WWW: http://portaudit.FreeBSD.org/9a0a892e-05d8-11e3-
ba09-000c29784fd1.html
=> Please update your ports tree and try again.
*** [check-vulnerable] Error code 1

Stop in /usr/ports/graphics/lcms2.
*** [build] Error code 1

Stop in /usr/ports/graphics/lcms2.
** Command failed [exit code 1]: /usr/bin/script -qa /tmp/
portupgrade20130820-93880-13u5qwy env UPGRADE_TOOL=portupgrade 
UPGRADE_PORT=lcms2-2.5 UPGRADE_PORT_VER=2.5 make
** Fix the problem and try again.
** Listing the failed packages (-:ignored / *:skipped / !:failed)
	! graphics/lcms2 (lcms2-2.5)	(unknown build error)
$

I have of course updated the ports tree but it made no difference.