message: Adding forward declaration (needed by root6)
diff: +AliGenerator* CreatePythia6Gen(Float_t e_cms, Int_t ptHardMin, Int_t ptHardMax, Int_t tune, Int_t cr,Float_t ptWeight);
  +
  AliGenerator* AddMCGenPythia(Float_t e_cms = 2760., Double_t ptHardMin = 0., Double_t ptHardMax = 1., Int_t tune = 2,Int_t cr=1,Float_t ptWeight=0)
  {
  //Add Pythia generator: pt-hard bin or min bias
  