Undefined symbols for architecture x86_64:
"___isPlatformVersionAtLeast", referenced from:
l052 in libWeiboSDK.a(WeiboSDK.o)
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)
Undefined symbols for architecture x86_64: "___isPlatformVersionAtLeast", referenced from: l052 in libWeiboSDK.a(WeiboSDK.o) ld: symbol(s) not found for architecture x86_64 clang: error: linker command failed with exit code 1 (use -v to see invocation)