message: including AliAODMCHeader
diff: #include "AliTrackContainer.h"
  #include "AliMCParticleContainer.h"
  #include "AliJetContainer.h"
  -#include "AliAODMCHeader.h"
  -
  +class AliAODMCHeader;
  class AliAODEvent;
  class TClonesArray;
  class AliEmcalJet;
  