Well, I've started to look for any clue. Went to /Library/Frameworks/OpenAL.framework, and what I've found was that date of changes for this framework shows april 2013. That's pretty strange, but what was even more weird is that al.h was almost 2 times smaller, than the one in Xcode's content! I've changed the name of this first one and copied OpenAL from Xcode to /Library/Frameworks and compilation went fine, thanks.