Hi Andrei, I am using ROOT 4.00/02 and in when I try to use TVirtualGeoTrack the compiler complained about TObjArray. When looking at the TVirtualGeoTrack.h code, there is an error in the include list. Instead of #ifndef ROOT_TObject //Should be ROOT_TObjArray #include "TObArray.h" //missing a j #endif it should be #ifbdef ROOT_TObjArray #include "TObjArray.h" #endif After I changed these two things everything compiled fine. I looked at version 4.00/00 and 3.10/02 code and the bug exists there too. Easy to miss if TObjArray.h is included elsewhere. Thanks Kerry
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