__tfi: unresolved reference

[FE]

Hi,
 
I am using g++ (gcc 2.95.2) on Sun Solaris 2.6 to build C++ shared libraries
which connect via C interface to an existing application. By declaring
everything as extern "C", all works fine as long as I do not use exception
handling in my shared object. The moment I introduce try, throw and catch
(i.e. all exceptions, none is passed to the calling application) to my
library the existing application reports "__tfi: referenced symbol not
found" and fails to load the shared object.
 
Do I have to link some (which?) additional libraries to my shared object? Or
is there any other way to make it work?
 
Thanks for suggestions,
 
Gert Hartmayer