Linking problem with VC++6

[Fiaschi]

I have tried to run the example program for non linear least-square fitting with
Microsoft Visual C++ 6. The compiler return only these 2 errors:
Linking...
fitting.obj : error LNK2001: unresolved external symbol
_gsl_multifit_fdfsolver_lmsder
fitting.obj : error LNK2001: unresolved external symbol _gsl_rng_default
Release/fitting.exe : fatal error LNK1120: 2 unresolved externals

How I can solve this problem?

Thanks!

Marco Fiaschi