`Ld /Users/Arcia_J/Library/Developer/Xcode/DerivedData/Cube-cxuuufrilllthcekkemlsdiswdom/Build/Intermediates/ArchiveIntermediates/Cube/IntermediateBuildFilesPath/UninstalledProducts/Cube normal x86_64
cd /Users/Arcia_J/Desktop/Cube
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/Arcia_J/Library/Developer/Xcode/DerivedData/Cube-cxuuufrilllthcekkemlsdiswdom/Build/Intermediates/ArchiveIntermediates/Cube/BuildProductsPath/Release -F/Users/Arcia_J/Library/Developer/Xcode/DerivedData/Cube-cxuuufrilllthcekkemlsdiswdom/Build/Intermediates/ArchiveIntermediates/Cube/BuildProductsPath/Release -filelist /Users/Arcia_J/Library/Developer/Xcode/DerivedData/Cube-cxuuufrilllthcekkemlsdiswdom/Build/Intermediates/ArchiveIntermediates/Cube/IntermediateBuildFilesPath/Cube.build/Release/Cube.build/Objects-normal/x86_64/Cube.LinkFileList -mmacosx-version-min=10.8 -stdlib=libc++ -framework GLUT -framework OpenGL -Xlinker -dependency_info -Xlinker /Users/Arcia_J/Library/Developer/Xcode/DerivedData/Cube-cxuuufrilllthcekkemlsdiswdom/Build/Intermediates/ArchiveIntermediates/Cube/IntermediateBuildFilesPath/Cube.build/Release/Cube.build/Objects-normal/x86_64/Cube_dependency_info.dat -o /Users/Arcia_J/Library/Developer/Xcode/DerivedData/Cube-cxuuufrilllthcekkemlsdiswdom/Build/Intermediates/ArchiveIntermediates/Cube/IntermediateBuildFilesPath/UninstalledProducts/Cube
Undefined symbols for architecture x86_64:
"GlRectangle::selfSetVertex(GlVertex, GlVertex, GlVertex, GlVertex)", referenced from:
GlSurface::GlSurface(GlVertex, GlVertex, GlVertex, GlVertex) in GlSurface.o
GlSurface::GlSurface(GlVertex*) in GlSurface.o
GlSquare::setVertex(GlVertex*) in GlSquare.o
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)
**一个是Undefined symbols for architecture x86_64，另一个是linker command failed with exit code 1 (use -v to see invocation)，用了网上好多方法都无法解决，怎么办？
