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#include <stdlib.h>
#include <stdio.h>
#include <CoreFoundation/CoreFoundation.h>
#include <Carbon/Carbon.h>

int success = 0;
int fail = 1;
int internal_error = success; // enable dwarf on internal errors

int main(int argc, const char **argv)
{
    CFURLRef cfurl;
    OSStatus err = LSFindApplicationForInfo(0, CFSTR("com.apple.Xcode"), 0, 0, &cfurl);
    if (err != noErr)
        return internal_error;
    
    CFBundleRef bundle = CFBundleCreate(0, cfurl);
    if (bundle == 0)
        return internal_error;

    CFStringRef str = CFStringRef(CFBundleGetValueForInfoDictionaryKey(bundle, CFSTR("CFBundleShortVersionString")));
    const char * ptr = CFStringGetCStringPtr(str, 0);
    if (ptr == 0)
        return internal_error;        

    // self-test
    const char * fail1 = "2.4";
    const char * fail2 = "2.4.0";
    const char * fail3  ="2.3";
    const char * ok1  = "2.4.1";
    const char * ok2  ="2.5";
    const char * ok3  ="3.0";
//    ptr = fail1;
//    printf ("string: %s\n", ptr);
   
    int length = strlen(ptr);
    if (length < 3) // expect "x.y" at least
        return internal_error;

    // fail on 2.4 and below (2.4.1 is ok)

     if (ptr[0] < '2')
        return fail;

    if (ptr[0] >= '3')
        return success;

    if (ptr[2] < '4')
        return fail;

    if (length < 5)
        return fail;

    if (ptr[4] < '1')
        return fail;
    
    return success;
}