下面是一个关于构建问题的了解，我只是没有得到它，我已经多种方式添加了SDK，每个人似乎都提出了不同的方法，是否有正确的方法??！我有xcode最新和facebooksdk最新。我认为这是我如何引用sdk但我应该如何引用它？还有其他想法吗？
Ld "/Users/stevetaylor/Library/Developer/Xcode/DerivedData/Late_Trains-bmoirwgxqmfapzbtjqzoklehuvpd/Build/Products/Debug-iphonesimulator/Late Trains.app/Late Trains" normal i386
cd "/Users/stevetaylor/Desktop/Iphone/Late Trains"
setenv IPHONEOS_DEPLOYMENT_TARGET 6.1
setenv PATH "/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/usr/bin:/Applications/Xcode.app/Contents/Developer/usr/bin:/usr/bin:/bin:/usr/sbin:/sbin"
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang -arch i386 -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator6.1.sdk -L/Users/stevetaylor/Library/Developer/Xcode/DerivedData/Late_Trains-bmoirwgxqmfapzbtjqzoklehuvpd/Build/Products/Debug-iphonesimulator "-L/Users/stevetaylor/Desktop/Iphone/Late Trains/../../../Documents/FacebookSDK/FacebookSDK.framework/Versions/A" -F/Users/stevetaylor/Library/Developer/Xcode/DerivedData/Late_Trains-bmoirwgxqmfapzbtjqzoklehuvpd/Build/Products/Debug-iphonesimulator "-F/Users/stevetaylor/Desktop/Iphone/Late Trains/../../../Documents/FacebookSDK" "-F/Users/stevetaylor/Desktop/Iphone/Late Trains" -filelist "/Users/stevetaylor/Library/Developer/Xcode/DerivedData/Late_Trains-bmoirwgxqmfapzbtjqzoklehuvpd/Build/Intermediates/Late Trains.build/Debug-iphonesimulator/Late Trains.build/Objects-normal/i386/Late Trains.LinkFileList" -Xlinker -objc_abi_version -Xlinker 2 -fobjc-arc -fobjc-link-runtime -Xlinker -no_implicit_dylibs -mios-simulator-version-min=6.1 -lsqlite3 -framework FacebookSDK -framework Social -framework UIKit -framework Foundation -framework CoreGraphics -framework Accounts -framework Social -framework AdSupport -o "/Users/stevetaylor/Library/Developer/Xcode/DerivedData/Late_Trains-bmoirwgxqmfapzbtjqzoklehuvpd/Build/Products/Debug-iphonesimulator/Late Trains.app/Late Trains"
ld: warning: ignoring file /Users/stevetaylor/Desktop/Iphone/Late Trains/Social.framework/Social, missing required architecture i386 in file /Users/stevetaylor/Desktop/Iphone/Late Trains/Social.framework/Social (2 slices)
ld: warning: ignoring file /Users/stevetaylor/Desktop/Iphone/Late Trains/Accounts.framework/Accounts, missing required architecture i386 in file /Users/stevetaylor/Desktop/Iphone/Late Trains/Accounts.framework/Accounts (2 slices)
ld: warning: ignoring file /Users/stevetaylor/Desktop/Iphone/Late Trains/AdSupport.framework/AdSupport, missing required architecture i386 in file /Users/stevetaylor/Desktop/Iphone/Late Trains/AdSupport.framework/AdSupport (2 slices)
架构i386的未定义符号：
"_ACFacebookAppIdKey", referenced from:
-[FBSystemAccountStoreAdapter requestAccessToFacebookAccountStore:defaultAudience:isReauthorize:appID:session:handler:] in FacebookSDK(FBSystemAccountStoreAdapter.o)
"_ACFacebookAudienceEveryone", referenced from:
-[FBSystemAccountStoreAdapter requestAccessToFacebookAccountStore:defaultAudience:isReauthorize:appID:session:handler:] in FacebookSDK(FBSystemAccountStoreAdapter.o)
"_ACFacebookAudienceFriends", referenced from:
-[FBSystemAccountStoreAdapter requestAccessToFacebookAccountStore:defaultAudience:isReauthorize:appID:session:handler:] in FacebookSDK(FBSystemAccountStoreAdapter.o)
"_ACFacebookAudienceKey", referenced from:
-[FBSystemAccountStoreAdapter requestAccessToFacebookAccountStore:defaultAudience:isReauthorize:appID:session:handler:] in FacebookSDK(FBSystemAccountStoreAdapter.o)
"_ACFacebookAudienceOnlyMe", referenced from:
-[FBSystemAccountStoreAdapter requestAccessToFacebookAccountStore:defaultAudience:isReauthorize:appID:session:handler:] in FacebookSDK(FBSystemAccountStoreAdapter.o)
"_ACFacebookPermissionsKey", referenced from:
-[FBSystemAccountStoreAdapter requestAccessToFacebookAccountStore:defaultAudience:isReauthorize:appID:session:handler:] in FacebookSDK(FBSystemAccountStoreAdapter.o)
"_OBJC_CLASS_$_ACAccountStore", referenced from:
objc-class-ref in FacebookSDK(FBSystemAccountStoreAdapter.o)
"_OBJC_CLASS_$_ASIdentifierManager", referenced from:
objc-class-ref in FacebookSDK(FBUtility.o)
"_OBJC_CLASS_$_SLComposeViewController", referenced from:
objc-class-ref in FacebookSDK(FBDialogs.o)
"_SLServiceTypeFacebook", referenced from:
+[FBDialogs composeViewControllerWithSession:handler:] in FacebookSDK(FBDialogs.o)
"_SecRandomCopyBytes", referenced from:
+[FBCrypto randomBytes:] in FacebookSDK(FBCrypto.o)
-[FBCrypto encrypt:additionalDataToSign:] in FacebookSDK(FBCrypto.o)
"_kSecRandomDefault", referenced from:
+[FBCrypto randomBytes:] in FacebookSDK(FBCrypto.o)
-[FBCrypto encrypt:additionalDataToSign:] in FacebookSDK(FBCrypto.o)
ld: symbol(s) not found for architecture i386
clang: error: linker command failed with exit code 1 (use -v to see invocation)