[CentOS] Need? php-iconv-?

I am experiencing a folder display problem in squirrelmail [SF issue 1471703] which is caused by messages containing a From: header whose data string matches the following regexp:

=?iso-2022-jp?B?[.*]=?=[.*]

It has been suggested that I require php-iconv extentions to solve this but I seem unable to locate a CentOS or RedHat-EL4 rpm providing this package. Can anyone point me to a location where I can get this package for CentOS-4.3? My current install looks like this:

php-4.3.9-3.9 php-pear-4.3.9-3.9 php-ldap-4.3.9-3.9 php-odbc-4.3.9-3.9 squirrelmail-1.4.3a-12.EL4.centos4

As I am a digest subscriber I request that any answers to the list also be copied directly to me.

Thanks, Jim