title: linker error with ShareKit ios
body: <p>i have spent 3 days for searching the solution. I don't know what to do with this... I need the -ObjC flag for SDWebImage library ( and AFNetworking too, i think) . I can remove it, and everything is fine with ShareKit, but not fine with SDwebImage.</p>
  
  <pre><code>Undefined symbols for architecture i386:
    "_ABAddressBookCopyArrayOfAllPeople", referenced from:
        ___48+[GPPAddressBook loadDeviceContactsWithHandler:]_block_invoke in GooglePlus(GPPAddressBook.o)
    "_ABAddressBookCreateWithOptions", referenced from:
        +[GPPAddressBook loadDeviceContactsWithHandler:] in GooglePlus(GPPAddressBook.o)
    "_ABAddressBookGetPersonCount", referenced from:
        ___48+[GPPAddressBook loadDeviceContactsWithHandler:]_block_invoke in GooglePlus(GPPAddressBook.o)
    "_ABAddressBookRequestAccessWithCompletion", referenced from:
        +[GPPAddressBook loadDeviceContactsWithHandler:] in GooglePlus(GPPAddressBook.o)
    "_ABMultiValueCopyValueAtIndex", referenced from:
        ___48+[GPPAddressBook loadDeviceContactsWithHandler:]_block_invoke in GooglePlus(GPPAddressBook.o)
    "_ABMultiValueGetCount", referenced from:
        ___48+[GPPAddressBook loadDeviceContactsWithHandler:]_block_invoke in GooglePlus(GPPAddressBook.o)
    "_ABPersonCopyImageDataWithFormat", referenced from:
        ___48+[GPPAddressBook loadDeviceContactsWithHandler:]_block_invoke in GooglePlus(GPPAddressBook.o)
    "_ABPersonHasImageData", referenced from:
        ___48+[GPPAddressBook loadDeviceContactsWithHandler:]_block_invoke in GooglePlus(GPPAddressBook.o)
    "_ABRecordCopyValue", referenced from:
        ___48+[GPPAddressBook loadDeviceContactsWithHandler:]_block_invoke in GooglePlus(GPPAddressBook.o)
    "_ACAccountTypeIdentifierFacebook", referenced from:
        -[SHKiOSFacebook accountTypeIdentifier] in libShareKit.a(SHKiOSFacebook.o)
    "_ACAccountTypeIdentifierSinaWeibo", referenced from:
        -[SHKSinaWeibo accountTypeIdentifier] in libShareKit.a(SHKSinaWeibo.o)
    "_ACAccountTypeIdentifierTwitter", referenced from:
        -[SHKiOSTwitter accountTypeIdentifier] in libShareKit.a(SHKiOSTwitter.o)
    "_ACFacebookAppIdKey", referenced from:
        -[SHKiOSFacebook authorizationFormShow] in libShareKit.a(SHKiOSFacebook.o)
    "_ACFacebookAudienceEveryone", referenced from:
        -[SHKiOSFacebook authorizationFormShow] in libShareKit.a(SHKiOSFacebook.o)
    "_ACFacebookAudienceKey", referenced from:
        -[SHKiOSFacebook authorizationFormShow] in libShareKit.a(SHKiOSFacebook.o)
    "_ACFacebookPermissionsKey", referenced from:
        -[SHKiOSFacebook authorizationFormShow] in libShareKit.a(SHKiOSFacebook.o)
    "_AVURLAssetPreferPreciseDurationAndTimingKey", referenced from:
        -[SHKFile getDuration] in libShareKit.a(SHKFile.o)
    "_CMTimeGetSeconds", referenced from:
        -[SHKFile getDuration] in libShareKit.a(SHKFile.o)
    "_MPMoviePlayerThumbnailImageKey", referenced from:
        -[GPPMediaPreviewView thumbnailImageRequestDidFinish:] in GooglePlus(GPPMediaPreviewView.o)
    "_MPMoviePlayerThumbnailImageRequestDidFinishNotification", referenced from:
        -[GPPMediaPreviewView initWithFrame:mediaAttachment:] in GooglePlus(GPPMediaPreviewView.o)
        -[GPPMediaPreviewView thumbnailImageRequestDidFinish:] in GooglePlus(GPPMediaPreviewView.o)
    "_OBJC_CLASS_$_ACAccountStore", referenced from:
        objc-class-ref in libShareKit.a(SHKiOSFacebook.o)
        objc-class-ref in libShareKit.a(SHKiOSSharer.o)
    "_OBJC_CLASS_$_ALAssetsLibrary", referenced from:
        objc-class-ref in GooglePlus(NSData+GPPAdditions.o)
        objc-class-ref in GooglePlus(UIDevice+GPPAdditions.o)
        objc-class-ref in libShareKit.a(SHKPhotoAlbum.o)
    "_OBJC_CLASS_$_AVURLAsset", referenced from:
        objc-class-ref in libShareKit.a(SHKFile.o)
    "_OBJC_CLASS_$_CLLocationManager", referenced from:
        objc-class-ref in GooglePlus(UIDevice+GPPAdditions.o)
        objc-class-ref in libShareKit.a(SHKFoursquareV2VenuesForm.o)
        objc-class-ref in libShareKit.a(SHKFoursquareV2.o)
    "_OBJC_CLASS_$_CMMotionManager", referenced from:
        objc-class-ref in GooglePlus(GPPSpamSignal.o)
    "_OBJC_CLASS_$_MPMoviePlayerController", referenced from:
        objc-class-ref in GooglePlus(GPPMediaPreviewView.o)
    "_OBJC_CLASS_$_SKStoreProductViewController", referenced from:
        objc-class-ref in libShareKit.a(EvernoteSession.o)
    "_OBJC_CLASS_$_SLComposeViewController", referenced from:
        objc-class-ref in libShareKit.a(SHKiOSSharer.o)
        objc-class-ref in libShareKit.a(SHKSinaWeibo.o)
    "_OBJC_CLASS_$_SLRequest", referenced from:
        objc-class-ref in libShareKit.a(SHKiOSFacebook.o)
        objc-class-ref in libShareKit.a(SHKiOSTwitter.o)
    "_SKStoreProductParameterITunesItemIdentifier", referenced from:
        -[EvernoteSession installAppWithId:withViewController:] in libShareKit.a(EvernoteSession.o)
    "_SLServiceTypeFacebook", referenced from:
        -[SHKiOSFacebook serviceTypeIdentifier] in libShareKit.a(SHKiOSFacebook.o)
        -[SHKiOSFacebook sendFeed] in libShareKit.a(SHKiOSFacebook.o)
        -[SHKiOSFacebook sendPhoto] in libShareKit.a(SHKiOSFacebook.o)
        -[SHKiOSFacebook sendVideo] in libShareKit.a(SHKiOSFacebook.o)
        -[SHKiOSFacebook fetchUserInfo] in libShareKit.a(SHKiOSFacebook.o)
    "_SLServiceTypeSinaWeibo", referenced from:
        +[SHKSinaWeibo canShare] in libShareKit.a(SHKSinaWeibo.o)
        -[SHKSinaWeibo share] in libShareKit.a(SHKSinaWeibo.o)
    "_SLServiceTypeTwitter", referenced from:
        -[SHKiOSTwitter serviceTypeIdentifier] in libShareKit.a(SHKiOSTwitter.o)
        -[SHKiOSTwitter sendStatusViaTwitter:mimeType:filename:] in libShareKit.a(SHKiOSTwitter.o)
        -[SHKiOSTwitter sendDataViaYFrog:mimeType:filename:] in libShareKit.a(SHKiOSTwitter.o)
        -[SHKiOSTwitter fetchUserInfo] in libShareKit.a(SHKiOSTwitter.o)
        -[SHKiOSTwitter downloadAPIConfiguration] in libShareKit.a(SHKiOSTwitter.o)
        -[SHKiOSTwitter authorizationYFrogHeader] in libShareKit.a(SHKiOSTwitter.o)
    "_kABPersonEmailProperty", referenced from:
        ___48+[GPPAddressBook loadDeviceContactsWithHandler:]_block_invoke in GooglePlus(GPPAddressBook.o)
    "_kABPersonFirstNameProperty", referenced from:
        ___48+[GPPAddressBook loadDeviceContactsWithHandler:]_block_invoke in GooglePlus(GPPAddressBook.o)
    "_kABPersonLastNameProperty", referenced from:
        ___48+[GPPAddressBook loadDeviceContactsWithHandler:]_block_invoke in GooglePlus(GPPAddressBook.o)
    "_kCLLocationAccuracyBest", referenced from:
        -[SHKFoursquareV2VenuesForm startMonitoringLocation] in libShareKit.a(SHKFoursquareV2VenuesForm.o)
  ld: symbol(s) not found for architecture i386
  clang: error: linker command failed with exit code 1 (use -v to see invocation)
  </code></pre>