#import <CoreServices/CoreServices.h>

SInt32 major, minor, bugfix;

Gestalt(gestaltSystemVersionMajor, &major);

Gestalt(gestaltSystemVersionMinor, &minor);

Gestalt(gestaltSystemVersionBugFix, &bugfix);

NSString *systemVersion = [NSString stringWithFormat:@"%d.%d.%d",

    major, minor, bugfix];

NSDictionary *systemVersionDictionary =

    [NSDictionary dictionaryWithContentsOfFile:

        @"/System/Library/CoreServices/SystemVersion.plist"];

NSString *systemVersion =

    [systemVersionDictionary objectForKey:@"ProductVersion"];