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I wrote a Cocoa app on my Mac which is 10.6.6. I sent it to a friend who has 10.5.7 and they got this error:
Cannot open this app with this version of OSX
How can I make my app retrocompatible with minimum 10.4 Tiger ?
Set the Mac OS X Deployment Target in your Target build settings to OS X 10.4. And make sure to not use any 10.5 or 10.6-only APIs without checking for their availability first.