谁能告诉我这些错误是什么意思？我正在尝试使用pip install命令安装python库并收到此错误。我有命令行开发工具，并从Apple Store下载了Xcode_10.2。我在这里迷路了。
clang: warning: libstdc++ is deprecated; move to libc++ with a minimum deployment target of OS X 10.9 [-Wdeprecated]
ld: library not found for -lstdc++
clang: error: linker command failed with exit code 1 (use -v to see invocation)
error: command 'g++' failed with exit status 1