How does one get UI_USER_INTERFACE_IDIOM() to work with iPhone OS SDK < 3.2

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I do this to get the code to compile in both 3.1.3 and 3.2:

BOOL iPad = NO;
#ifdef UI_USER_INTERFACE_IDIOM
iPad = (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPad);
#endif
if (iPad) {
// iPad specific code here
} else {
// iPhone/iPod specific code here
}

I also wrote a quick blog post about it here:
http://www.programbles.com/2010/04/03/compiling-conditional-code-in-universal-iphone-ipad-applications/

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