ios - Weak reference to constans? -


i'm trying use library built in xcode 5 link in app in xcode 4. library has references constants defined in ios7 sdk, not in ios6 sdk.

so i'm getting error:

undefined symbols architecture armv7s: "_cbperipheralmanagerrestoredstateserviceskey", referenced from:

is there way preserve backward compatibility xcode 4 , sdk ios6?

+ (nsstring *)getcorebluetoothconstantbyname:(nsstring *)name     {     void *libhandle = dlopen("/system/library/frameworks/corebluetooth.framework/corebluetooth", rtld_local);  if (libhandle != null)     {     nsstring **key = dlsym(libhandle, [name cstringusingencoding:nsasciistringencoding]);      dlclose(libhandle);      return [[*key copy] autorelease];     }  return nil; }

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