curl fails to upgrade on 9.1-RELEASE-p3 but succeeds on 8.3

[Leslie Jensen]

===>  Cleaning for curl-7.24.0_4
===>  curl-7.24.0_4 has known vulnerabilities:
curl-7.24.0_4 is vulnerable:
cURL library -- heap corruption in curl_easy_unescape

WWW: http://portaudit.FreeBSD.org/01cf67b3-dc3b-11e2-a6cd-c48508086173.html
=> Please update your ports tree and try again.
*** [check-vulnerable] Error code 1

Stop in /usr/ports/ftp/curl.
*** [build] Error code 1

Stop in /usr/ports/ftp/curl.

===>>> make failed for ftp/curl
===>>> Aborting update

===>>> Update for ftp/curl failed
===>>> Aborting update

===>>> Killing background jobs


I've done this upgrade on a 8.3 system without problems, but it stops on 
my 9.1 laptop. Ports tree is updated.

/Leslie