每次从CocoaPods导入文件时，我都会遇到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
对于我使用的各种豆荚，我得到了大约12个这样的东西.
我正在try 使用XCode5为iPhone5S构建.
我一直在try 各种各样的解决方案，但都还没有成功.
How do I fix this Apple Mach-O Linker Error?个
刚刚发现了另一个可能很有趣的警告，我希望这能 bootstrap 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
