A question about Gnu Global

[Water Lin]

I want to read code in Emacs under Linux because there is no perfect
software to read code under Linux.

I choose use Gnu Global to replace etags in Emacs. After I use command
$ ctags in shell under my souce folder, I can jump between code in my
souce file.

But there are some definition binding to system header file like time.h
. When I want to jump to the declaration of this function, Emacs said
that tag is not found.

Why? Should I use $ gtags under system header folder too?

Thanks

Water Lin

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