pam_radius authentication

[Reinhard Brandstaedter]

Hi!

I'm trying to use pam_radius (called from mod_auth_pam with apache2) for 
authentication against a windows 2000 IAS Radius Server.

The Apache2 Configuration works so far but when it gets to pam_radius I 
get an error message and the radius server is never contacted:

Mar 10 08:43:22 turtle apache2[27259]: PAM unable to resolve symbol: 
pam_sm_authenticate
Mar 10 08:43:22 turtle apache2[27259]: PAM unable to resolve symbol: 
pam_sm_setcred

My PAM configuration for apache2:

auth     sufficient  /lib/security/pam_radius.so conf=/etc/radius.conf
account  sufficient  /lib/security/pam_radius.so conf=/etc/radius.conf

auth     required    /lib/security/pam_winbind.so
account  required    /lib/security/pam_winbind.so

and my radius.conf:

auth    amsdc1.ams.stiwa.com:1645  "<secret>"    5 4
acct    amsdc1.ams.stiwa.com:1645  "<secret>"    5 4

PAM version is:
*  sys-libs/pam
       Latest version available: 0.77-r6
       Latest version installed: 0.77-r6
       Size of downloaded files: 3,552 kB
       Homepage:    http://www.kernel.org/pub/linux/libs/pam/
       Description: Pluggable Authentication Modules
       License:     PAM

Linux turtle 2.6.8-gentoo-r3 #5 SMP Thu Oct 28 15:24:14 CEST 2004 i686 
Intel(R) Xeon(TM) CPU 3.06GHz GenuineIntel GNU/Linux


I thought there might be something wrong with some libraries but I 
couldn't get a clue which ones. Neither helped me any googeling for days 
now.
Can anyone help me on this?

Thanks,
Reinhard