如何为v10.5或更早的版本使用这个NSPasteboard代码?

I'm trying to to paste something to the generalPasteboard but I keep getting some warnings because I'm using 10.6 coding in my 10.5 app. Can someone please fix this code to make it compile for 10.5 or earlier versions of OS X. ThanksI'm trying to to paste something to the general