Get new mails notification from GMail?

Is there an easy开发者_如何学运维 way to get a notification from Google when a Google Mail user gets a new mail? Read- /write support, etc. is not needed.

I'm looking for solutions in C, Objective-C or C++.

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You can either access the account via IMAP (has to be enabled in the users GMail settings) or wait for their official tool to support GMail.