ios：根据白皮书集成的demo，在使用PDRCore的时候Xcode，这个是导入出错了吗？

Undefined symbols for architecture x86_64:
"_kCGImagePropertyGIFUnclampedDelayTime", referenced from:
-[PTGIF initWithGIFData:] in liblibPDRCore.a(PDRToolSystemEx.o)
"_CGImageSourceGetCount", referenced from:
-[PTGIF initWithGIFData:] in liblibPDRCore.a(PDRToolSystemEx.o)
"_kCGImagePropertyGIFDelayTime", referenced from:
-[PTGIF initWithGIFData:] in liblibPDRCore.a(PDRToolSystemEx.o)
"_CGImageSourceCopyPropertiesAtIndex", referenced from:
-[PTGIF initWithGIFData:] in liblibPDRCore.a(PDRToolSystemEx.o)
"_CGImageSourceCreateImageAtIndex", referenced from:
-[PTGIF initWithGIFData:] in liblibPDRCore.a(PDRToolSystemEx.o)
"_CGImageSourceCreateWithData", referenced from:
-[PTGIF initWithGIFData:] in liblibPDRCore.a(PDRToolSystemEx.o)
"_kCGImagePropertyGIFDictionary", referenced from:
-[PTGIF initWithGIFData:] in liblibPDRCore.a(PDRToolSystemEx.o)
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)