Hi All, I'm trying to add some basic Histogramming to mt Geant4 application. I get an error when compiling from the line below when I try to create the file. hfile = new TFile("hsimple.root","RECREATE","Demo ROOT file with histograms"); Here is the message from the compiler: /usr/local/geant4/tmp/Linux-g++/geanttest/libgeanttest.a(UldbHistograms.o): In function `UldbHistograms::RecordBeginOfRun(G4Run const *)': UldbHistograms.o(.text+0xea): undefined reference to `TFile::TFile(char const *, char const *, char const *, int)' collect2: ld returned 1 exit status I'm using ROOT v2.24 on Linux Mandrake 7.0 with Geant4 2.0. All suggestions are helpful. Mark
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