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Just checked out the latest trunk and there are some typos with the backwards compatibility:
if ([!self respondsToSelector:@selector(attributesOfItemAtPath:error:)])
"Invalid receiver type 'int'
if (![self respondsToSelector:@selector(attributesOfItemAtPath:error:)])
There are 3 other identical typos.
Also, from what I can tell, there shouldn't be any need for #including Carbon anymore - it looks like all the data types IconFamily uses are now part of CoreServices (CarbonCore).