IOS BUGS5 linker command failed with exit code 1 (use-v to see invocation)

ld/users/rubert/library/developer/xcode/deriveddata/oc_language-emftyzftyvhdpuaxipddjmpnpvox/build/products/ Debug/oc_language Normal x86_64

Cd/users/rubert/ios/iworkspace/oc_language

Export macosx_deployment_target=10.10

   /applications/xcode-beta.app/contents/developer/toolchains/xcodedefault.xctoolchain/usr/bin/clang- Arch x86_64-isysroot/applications/xcode-beta.app/contents/developer/platforms/macosx.platform/developer/sdks/ macosx10.11.sdk-l/users/rubert/library/developer/xcode/deriveddata/oc_language-emftyzftyvhdpuaxipddjmpnpvox/ Build/products/debug-f/users/rubert/library/developer/xcode/deriveddata/oc_ language-emftyzftyvhdpuaxipddjmpnpvox/build/products/debug-filelist/users/rubert/library/developer/xcode/ Deriveddata/oc_language-emftyzftyvhdpuaxipddjmpnpvox/build/intermediates/oc_language.build/debug/oc_ Language.build/objects-normal/x86_64/oc_language.linkfilelist-mmacosx-version-min=10.10-fobjc-arc- Fobjc-link-runtime-xlinker-dependency_info-xlinker/users/rubert/library/developer/xcode/deriveddata/oc_ language-emftyzftyvhdpuaxipddjmpnpvox/build/intermediates/oc_language.build/debug/oc_language.build/ Objects-normal/x86_64/oc_language_dependency_info.dat-o/users/rubert/libraRy/developer/xcode/deriveddata/oc_language-emftyzftyvhdpuaxipddjmpnpvox/build/products/debug/oc_language

Undefined Symbols for Architecture x86_64:

"_objc_class_$_persion", referenced from:

Objc-class-ref in MAIN.O

Ld:symbol (s) not found for architecture x86_64

Clang:error:linker command failed with exit code 1 (use-v to see invocation)

http://blog.csdn.net/hengshujiyi/article/details/21182813

IOS BUGS5 linker command failed with exit code 1 (use-v to see invocation)