three20:源代码错误的three20框架?

Ld /Users/guxinchao1/Desktop/three20/Build/Products/Debug-iphonesimulator/CoreUnitTests.octest/CoreUnitTests normal i386 cd /Users/guxinchao1/Desktop/three20/src/Three20Core export IPHONEOS_DEPLOYMENT_TARGET=3.0 export 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 -bundle -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator8.1.sdk -L/Users/guxinchao1/Desktop/three20/Build/Products/Debug-iphonesimulator -L/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator8.1.sdk/usr/lib -F/Users/guxinchao1/Desktop/three20/Build/Products/Debug-iphonesimulator -F/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator8.1.sdk/Developer/Library/Frameworks -filelist /Users/guxinchao1/Desktop/three20/Build/Three20Core.build/Debug-iphonesimulator/Three20CoreUnitTests.build/Objects-normal/i386/CoreUnitTests.LinkFileList -Xlinker -objc_abi_version -Xlinker 2 -ObjC -framework UIKit -framework CoreGraphics -framework Foundation -framework SenTestingKit -framework CoreGraphics -fobjc-link-runtime -Xlinker -no_implicit_dylibs -mios-simulator-version-min=3.0 -lThree20Core -Xlinker -dependency_info -Xlinker /Users/guxinchao1/Desktop/three20/Build/Three20Core.build/Debug-iphonesimulator/Three20CoreUnitTests.build/Objects-normal/i386/CoreUnitTests_dependency_info.dat -o /Users/guxinchao1/Desktop/three20/Build/Products/Debug-iphonesimulator/CoreUnitTests.octest/CoreUnitTests 

ld:找不到符号dyld_stub_binding_helper,通常在crt1.o / dylib1.o / bundle1.o中,对于体系结构i386 clang:error:linker命令失败,退出代码1(使用-v查看调用)