undefined references

[gnuml]

Hi,

I am trying to compile some C++ code and link it to a couple of C++
libraries (Informix c++ libs). However, I get 'undefined references' for every
object from the libraries I use. The code compiles fine though.
Could anybody give me some suggestions on how to test the libraries/what
to be aware of when linking/what might cause the problem?
I'm using gcc 3.3.1 and all librarie are in place & specified in the
makefile.
Thanks alot!

Martin