[Gate-users] gate installation error

[saeed heidary]

dear user  i have  just stated installing gate
and i encountered this error message
Making dependency for file Gate.cc ...
In file included from ./source/physics/include/GateSourceMgr.hh:20,
                 from Gate.cc:21:
./source/physics/include/GateSourcePhaseSpace.hh:14:19: error: TROOT.h: No
such file or directory

  ./source/physics/include/GateSourcePhaseSpace.hh:15:19: error: TFile.h: No
such file or directory


and so on,

any body knows the reason?
thanks