README1.md

Ld /Users/nmstech/Library/Developer/Xcode/DerivedData/NAKL-dpardqrwpmjiuhgivowjjbhyjpab/Build/Products/Debug/NAKL.app/Contents/MacOS/NAKL normal x86_64
    cd "/Users/nmstech/Desktop/XUAN CUONG/huyphan-NAKL-e2c5b08"
    export MACOSX_DEPLOYMENT_TARGET=10.8
    /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang -arch x86_64 -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.9.sdk -L/Users/nmstech/Library/Developer/Xcode/DerivedData/NAKL-dpardqrwpmjiuhgivowjjbhyjpab/Build/Products/Debug -F/Users/nmstech/Library/Developer/Xcode/DerivedData/NAKL-dpardqrwpmjiuhgivowjjbhyjpab/Build/Products/Debug -filelist /Users/nmstech/Library/Developer/Xcode/DerivedData/NAKL-dpardqrwpmjiuhgivowjjbhyjpab/Build/Intermediates/NAKL.build/Debug/NAKL.build/Objects-normal/x86_64/NAKL.LinkFileList -mmacosx-version-min=10.8 -fobjc-link-runtime -framework Carbon -framework Cocoa -Xlinker -dependency_info -Xlinker /Users/nmstech/Library/Developer/Xcode/DerivedData/NAKL-dpardqrwpmjiuhgivowjjbhyjpab/Build/Intermediates/NAKL.build/Debug/NAKL.build/Objects-normal/x86_64/NAKL_dependency_info.dat -o /Users/nmstech/Library/Developer/Xcode/DerivedData/NAKL-dpardqrwpmjiuhgivowjjbhyjpab/Build/Products/Debug/NAKL.app/Contents/MacOS/NAKL

Undefined symbols for architecture x86_64:
  "_OBJC_CLASS_$_KeyboardHandler", referenced from:
      objc-class-ref in AppDelegate.o
      objc-class-ref in KeyboardHandler.o
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)