How do I concatenate a defines and a string

Code:

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#define CONFIG_PATH "/etc/openvpn/conf"

glob_t gl;

glob("/etc/openvpn/conf/*.conf", 0, NULL, &gl);

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Consider the above. I want to utilize the CONFIG_PATH defines in the glob statement.
How can I do this economically and without reducing performance?

Thanks.

What, you mean this?

Code:

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glob(CONFIG_PATH "/*.conf", 0, NULL, &gl);

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I didn't know you could concat strings like that in C.

Thanks for that.

That only works for string literals.