Library missing? - Minuit2.so not found

Hello

I am trying to execute the numerical minimization example http://root.cern.ch/root/html/tutorials/fit/NumericalMinimization.C.html

However, after executing, I get the following error:

Error in <TUnixSystem::DynamicPathName>: Minuit2[.so | .dll | .dylib | .sl | .dl | .a] does not exist
in /home/main/Gate/root/lib:/home/main/Gate/root/lib:/home/main/Gate/CLHEP/lib:/home/main/Gate/gate/tmp//Gate:/home/main/Gate/root/lib:/home/main/Gate/CLHEP/lib:/usr/local/lib:/home/main/Gate/gate/tmp/Linux-g++/Gate:.:/home/main/Gate/root/lib::/home/main/Gate/root/cint/cint/stl

• Break *** segmentation violation

It seems a library is missing.
I am using the most current version of ROOT(self compiled from source), being 5.30/00, on Ubuntu 11.04.

How can I circumvent that problem (e.g. by installing the needed library)?

Cheers,
Hermann Fuchs

-- 
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DI Hermann Fuchs
Div. Medical Radiation Physics
Department of Radiotherapy
Med. Univ. Vienna / AKH Vienna
Währinger Gürtel 18-20
A-1090 Wien

Tel.  + 43 / 1 / 40 400 7271
Mail. hermann.fuchs_at_meduniwien.ac.at