Which header file include the "gStyle" global pointer?

___when i use root library to make a c++ projection, the header file “TSystem.h” is added, but the IDE vs2019 still indicate the “gStyle” global pointer can not be found. which header file shauld i add?

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ROOT Version: 6.22-06
Platform: win10
Compiler: Vs2019



Note that the reference guide tells you that if you search “gStyle” in the search box.

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