How to declare global pointers like gSystem?

__when i use root library to write garfield++ code, the global pointer gSystem was used:
after compiling the code, the error occured:

error: ‘gSystem’ was not declared in this scope; did you mean ‘system’?

how to declare the global pointers like gSystem?

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ROOT Version: 6.22/06
Platform: ubuntu 20.04
_Compiler:_Gcc 9.3.0

#include "TSystem.h"

@ Wile_E_Coyote,thanks!

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