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Half a jiff -- is this your header file (since you have an include guard at the top)? That's not at all what a header file should look like. A header file for this should look roughly like

...

As we say, if it's not in the header file, then as far as anybody else is concerned it doesn't exist. What more could you possibly ask for?

So don't put that variable name in the header. There's no reason to, anyway; just put it in the .c file only and everybody will be happy.