"pip install ephem"에서 왜이 오류가 발생합니까?

xcrun: error: invalid active developer path (/Library/Developer/CommandLineTools), missing xcrun at: /Library/Developer/CommandLineTools/usr/bin/xcrun

error: command '/usr/bin/clang' failed with exit status 1

----------------------------------------
Cleaning up...
Command /Library/Frameworks/Python.framework/Versions/2.7/Resources/Python.app/Contents/MacOS/Python -c "import setuptools, tokenize;__file__='/private/var/folders/12/knn7d9c16gd1f0jkjr740q100000gn/T/pip_build_Philip/ephem/setup.py';exec(compile(getattr(tokenize, 'open', open)(__file__).read().replace('\r\n', '\n'), __file__, 'exec'))" install --record /var/folders/12/knn7d9c16gd1f0jkjr740q100000gn/T/pip-2XJEpS-record/install-record.txt --single-version-externally-managed --compile failed with error code 1 in /private/var/folders/12/knn7d9c16gd1f0jkjr740q100000gn/T/pip_build_Philip/ephem
Storing debug log for failure in /Users/Philip/.pip/pip.log

설치 메시지가 끝나면 이러한 오류가 발생합니다. 여기에 있어야 할 내 디렉토리 중 하나가 누락 되었습니까? 이 문제를 어떻게 수정합니까?

xcrun이 누락 된 것 같습니다. 다음을 시도하십시오. xcode-select --install