PHP 5.2.3 module on Solaris 10 (AMD64)

[web2@xxxxxxxxxxxxxx]

I tried the latest version 5.2.3 on Solaris 10(AMD64) as a module on 
Apache 2.0.59.
After the compilation, and installation, I've tried to restart Apache 
and I have this error message :

Syntax error on line 232 of /www/apache-2.0.59/conf/httpd.conf:
Cannot load /www/apache2/modules/libphp5.so into server: ld.so.1: httpd:
fatal: /usr/lib/libmtmalloc.so.1: wrong ELF class: ELFCLASS32

For info, everything's ok with PHP 5.2.2.

Thanks for help