Upgrading Old Code from OS X 10.6 to 10.7

I am trying to update ODBCQueryTool so that it builds under 10.7. It was originally aimed against 10.6, which is not directly supported in new versions of Xcode. At the moment, the working assembly will be fine, but ideally I would like to create a version that will be built and will work on 10.5 or later.

So, to get started, I downloaded and installed the 10.6 SDK. Many problems disappeared at this point, but I got a series of them:

ld: warning : directory not found for option '-F/Users/maury/Develop/odbckit/ODBCQueryTool/../ODBCKit/build/Release'

Undefined symbols for architecture x86_64:
  "_OBJC_CLASS_$_NSMutableOrderedSet", referenced from:
      objc-class-ref in libarclite_macosx.a(arclite.o)

I can not find anything useful on Google. I got the impression that ARC was part 10.7 and newer, so it’s not clear why I get them at all.

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