How to declare global pointers like gSystem?

ROOT
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__when i use root library to write garfield++ code, the global pointer gSystem was used:
gSystem->Load(“libGeom”);
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

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#include "TSystem.h"

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@ Wile_E_Coyote，thanks!

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