samba - Sep 2008 - How to change samba password through libsmbclient.so?

Hello,

I am writing a C/C++ program that needs to modify a user's samba password.
The program runs as root and on the same computer as samba. I found the
"local_password_change" function in libsmbclient.so, that seems to do
what I need, but I always get a linking error, although I link against
libsmbclient.so. It seems as "local_password_change" is not exported
or has only local visibility. Does anybody have experiences with this function
or does anybody know if this is the correct funtion at all?

As a work-around my programs forks and executes "smbpasswd" at the
moment. But I do not like the idea.

Matthias