Mono installation problem

Hi all. I am having some problems for installing mono 1.9.1 under suse 9.
When I install Mono 1.9.1 via YaST, the installation process doesn't return any errors.
The wired things is, when I run Console App, it is OK. But once I run WinForms App, the UI is become un-usable. Then I use this command:
 MONO_LOG_LEVEL=debug  MONO_LOG_MASK=dll mono testapp.exe

I got following:
DllImport attempting to load: 'libc.so.6'.
Mono-INFO: DllImport loading location: 'libc.so.6.so'.
Mono-INFO: DllImport error loading library: 'libc.so.6.so: cannot open shared object file: No such file or directory'.
Mono-INFO: DllImport loading library: './libc.so.6.so'.
Mono-INFO: DllImport error loading library './libc.so.6.so: cannot open shared object file: No such file or directory'.
Mono-INFO: DllImport loading: 'libc.so.6'.
Mono-INFO: Searching for 'uname'.............................................

Anyone know how to config mono to point to correct lib path?

Thanks