Including header file with global variable

I need to include a header file that contains some global variables (not mine so I cannot 开发者_如何学Pythonchange it).

How do I do this so that the variables within the included file are considered 'extern' in all but one case?

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You cannot. Copy the header and add extern yourself.

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If the variables are only declared in the header, but aren't assigned a value, then you might be able to do this, depending on the compiler. GCC, for example, has the -fno-common flag to control this behavior.