Dear rooters I have a problem; I'm trying to compile my first root program; if I derive a class from a TObject I get the following result: gcc Muone.C -Wno-deprecated -O -Wall -fPIC -pthread -I/cern/root/include -L-L/cern/root/lib -lCore -lCint -lHist -lGraf -lGraf3d -lGpad -lTree -lRint -lPostscript -lMatrix -lPhysics -pthread -lm -ldl -rdynamic -L/cern/root/lib -lCore -lCint -lHist -lGraf -lGraf3d -lGpad -lTree -lRint -lPostscript -lMatrix -lPhysics -lGui -pthread -lm -ldl -rdynamic -o Muone tmp/ccwxZ1PI.o(.text+0x41): In function `__static_initialization_and_destruction_0(int, int)': : undefined reference to `ROOT::GenerateInitInstance(Muone const*)' collect2: ld returned 1 exit status make: *** [Muone] Error 1 The code is the following: Muone.C #include "Muone.h" ClassImp(Muone); int main() { }; Muone.h #include "TObject.h" class Muone : public TObject { public: Muone() {}; virtual ~Muone() {}; private: Float_t Mene; //muon energy ClassDef(Muone,0) //Eas Muone }; Thanks for your help Marco
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