Undefined symbol "slprintf"

[Christophe <xof@xxxxxxxxxxxx>]

Hi,

I'm attempting to install a PHP-based package (PhpMyAdmin) on FreeBSD  
(5.4), PHP 5.2.3, Apache 1.3. When I try to execute any script, I  
receive the error:

/libexec/ld-elf.so.1: /usr/local/lib/php/20060613/session.so:  
Undefined symbol "slprintf"

(This occurs very early in the process; I don't receive any PHP errors.)

What puzzles me is that just standard session handling (writing tests  
using session_start, etc.) seem to work fine, as well as other PHP  
scripts on the same box.

I suspect I'm doing something obviously wrong, but I can't find it.  
Any thoughts? Thanks so much!