每次从 CocoaPods 导入文件时，我都会收到 Apple Mach-O 链接器错误。

Undefined symbols for architecture arm64:
  "_OBJC_CLASS_$_FBSession", referenced from: someFile
ld: symbol(s) not found for architecture arm64

对于我使用的各种 Pod，我得到了大约 12 个。

我正在尝试使用 XCode 5 为 iPhone 5S 构建。

我一直在这里尝试各种解决方案，但还没有任何一个可以工作。

如何修复此 Apple Mach-O 链接器错误？

刚刚发现另一个可能很有趣的警告，我希望这能引导我找到解决方案：

Ignoring file ~/Library/Developer/Xcode/DerivedData/SomeApp/Build/Products/Debug-iphoneos/libPods.a,

file was built for archive which is not the architecture being linked
(arm64):~/Library/Developer/Xcode/DerivedData/someApp/Build/Products/Debug- iphoneos/libPods.a