wget http://project-mathlibs.web.cern.ch/project-mathlibs/sw/Minuit2.tar.gz
tar -xzvf Minuit2.tar.gz           
cd Minuit2-5.18.00/
./configure --prefix=$PWD  
make install 
mkdir ups
cp $MINUIT_DIR/ups/minuit.table ups/minuit2.table
eups declare -c -r $PWD minuit2 5.18.00

BTW, there is a nice Google python interface to MINUIT2 we might want to consider using at  http://code.google.com/p/pyminuit/.