percona 5.5.33 included pam AND latest trunk won't load

Hi, I have installed Percona rpms on a CentOS6 server:
Percona-Server-client-55-5.5.32-rel31.0.549.rhel6.x86_64
Percona-Server-shared-compat-5.5.32-rel31.0.549.rhel6.x86_64
Percona-Server-shared-55-5.5.32-rel31.0.549.rhel6.x86_64
Percona-Server-server-55-5.5.32-rel31.0.549.rhel6.x86_64

But when I try to enable the auth_pam plugin:
mysql> INSTALL PLUGIN auth_pam_server SONAME 'auth_pam.so';
ERROR 1127 (HY000): Can't find symbol 'auth_pam_server' in library

Everything looks fine:
mysql> show variables like '%plugin%';
+---------------+--------------------------+
| Variable_name | Value |
+---------------+--------------------------+
| plugin_dir | /usr/lib64/mysql/plugin/ |
+---------------+--------------------------+
1 row in set (0.00 sec)

mysql> exit
Bye
[root@ks-dmz-mysql-t01 ~]# ls /usr/lib64/mysql/plugin/auth_pam.so -l
-rwxr-xr-x. 1 root root 13136 Jul 1 05:26 /usr/lib64/mysql/plugin/auth_pam.so

I found one(!) hit on google: http://www.percona.com/forums/questi...in-not-working
But since I haven't compiled this plugin myself (Percona has) - I find it odd, that it should have been compiled wrongly.. ?

I also tried 5.5.33 - and I also tried compiling the plugin myself from bzr trunk - and it failed the exact same way.

I was really looking forward to working with the pam plugin.. :(

See also:
http://www.percona.com/forums/questions-discussions/mysql-and-percona-server/11660-percona-5-5-32-mysql-pam-plugin-bug