error loading cxx local model in isis: undefined symbol

Dear isis-users,

did anyone experience problems including a cxx local model in isis?

Here is my problem: I compile it once with xspec:

initpackage fun_test lmodel.dat .

While I can load (and evaluate) it in xspec without errors:

XSPEC12>lmod fun_test .
Model package fun_test successfully loaded.

however, for the same model library (without any recompiling), isis 
complains with

isis> load_xspec_local_models (".");
Loading ././libfun_test.so
Error loading symbol C_test for model fun
Link error: ././libfun_test.so: undefined symbol: C_test

And isis is somehow right, as C_test is not defined ("nm -D 
libfun_test.so | grep C_test" does not give a result).

What am I missing here? Is there a difference, how I need to treat xspec 
and isis local models? I know that the "C_" has to be included in the 
lmodel.dat file to tell xspec/isis that this is C/C++ code and not fortran.

I have the latest isis version 1.6.2-27 and heasoft 6.14 installed.

Thanks for your help.

Cheers,
Thomas

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