当我运行 python 3 -m pip install -U discord.py 时，我收到错误（见下文），说无法建造轮子。我已经尝试过 pip install wheel 它返回 Requirement already compatible: wheel in /usr/local/lib/python3.7/site-packages (0.31.1) 我尝试过 pip install -U discord.py --no-cache- dir 并且它仍然返回错误我相信我正在使用 python 3.7.0。如果有帮助，我正在使用 Macbook？我对此有点陌生，所以任何帮助将不胜感激！
Collecting discord.py
Using cached discord.py-1.3.3-py3-none-any.whl (676 kB)
Collecting websockets!=7.0,!=8.0,!=8.0.1,<9.0,>=6.0
Using cached websockets-8.1-cp37-cp37m-macosx_10_6_intel.whl (66 kB)
Collecting aiohttp<3.7.0,>=3.6.0
Using cached aiohttp-3.6.2-py3-none-any.whl (441 kB)
Collecting multidict<5.0,>=4.5
Using cached multidict-4.7.5.tar.gz (50 kB)
Installing build dependencies ... done
Getting requirements to build wheel ... done
Preparing wheel metadata ... done
Requirement already satisfied, skipping upgrade: async-timeout<4.0,>=3.0 in /usr/local/lib/python3.7/site-packages (from aiohttp<3.7.0,>=3.6.0->discord.py) (3.0.1)
Collecting attrs>=17.3.0
Using cached attrs-19.3.0-py2.py3-none-any.whl (39 kB)
Collecting yarl<2.0,>=1.0
Using cached yarl-1.4.2.tar.gz (163 kB)
Requirement already satisfied, skipping upgrade: chardet<4.0,>=2.0 in /usr/local/lib/python3.7/site-packages (from aiohttp<3.7.0,>=3.6.0->discord.py) (3.0.4)
Requirement already satisfied, skipping upgrade: idna>=2.0 in /usr/local/lib/python3.7/site-packages (from yarl<2.0,>=1.0->aiohttp<3.7.0,>=3.6.0->discord.py) (2.8)
Building wheels for collected packages: multidict, yarl
Building wheel for multidict (PEP 517) ... error
ERROR: Command errored out with exit status 1:
command: /usr/local/opt/python/bin/python3.7 /usr/local/lib/python3.7/site-packages/pip/_vendor/pep517/_in_process.py build_wheel /var/folders/gd/hk_mr3y15xqd49ty5xfkqjhw0000gp/T/tmpifkk05yv
cwd: /private/var/folders/gd/hk_mr3y15xqd49ty5xfkqjhw0000gp/T/pip-install-xoap8323/multidict
Complete output (44 lines):
**********************
* Accellerated build *
**********************
running bdist_wheel
running build
running build_py
creating build
creating build/lib.macosx-10.11-x86_64-3.7
creating build/lib.macosx-10.11-x86_64-3.7/multidict
copying multidict/__init__.py -> build/lib.macosx-10.11-x86_64-3.7/multidict
copying multidict/_abc.py -> build/lib.macosx-10.11-x86_64-3.7/multidict
copying multidict/_compat.py -> build/lib.macosx-10.11-x86_64-3.7/multidict
copying multidict/_multidict_base.py -> build/lib.macosx-10.11-x86_64-3.7/multidict
copying multidict/_multidict_py.py -> build/lib.macosx-10.11-x86_64-3.7/multidict
running egg_info
writing multidict.egg-info/PKG-INFO
writing dependency_links to multidict.egg-info/dependency_links.txt
writing top-level names to multidict.egg-info/top_level.txt
reading manifest file 'multidict.egg-info/SOURCES.txt'
reading manifest template 'MANIFEST.in'
warning: no previously-included files matching '*.pyc' found anywhere in distribution
warning: no previously-included files found matching 'multidict/_multidict.html'
warning: no previously-included files found matching 'multidict/*.so'
warning: no previously-included files found matching 'multidict/*.pyd'
warning: no previously-included files found matching 'multidict/*.pyd'
no previously-included directories found matching 'docs/_build'
writing manifest file 'multidict.egg-info/SOURCES.txt'
copying multidict/__init__.pyi -> build/lib.macosx-10.11-x86_64-3.7/multidict
copying multidict/_multidict.c -> build/lib.macosx-10.11-x86_64-3.7/multidict
copying multidict/py.typed -> build/lib.macosx-10.11-x86_64-3.7/multidict
creating build/lib.macosx-10.11-x86_64-3.7/multidict/_multilib
copying multidict/_multilib/defs.h -> build/lib.macosx-10.11-x86_64-3.7/multidict/_multilib
copying multidict/_multilib/dict.h -> build/lib.macosx-10.11-x86_64-3.7/multidict/_multilib
copying multidict/_multilib/istr.h -> build/lib.macosx-10.11-x86_64-3.7/multidict/_multilib
copying multidict/_multilib/iter.h -> build/lib.macosx-10.11-x86_64-3.7/multidict/_multilib
copying multidict/_multilib/pair_list.h -> build/lib.macosx-10.11-x86_64-3.7/multidict/_multilib
copying multidict/_multilib/views.h -> build/lib.macosx-10.11-x86_64-3.7/multidict/_multilib
running build_ext
building 'multidict._multidict' extension
creating build/temp.macosx-10.11-x86_64-3.7
creating build/temp.macosx-10.11-x86_64-3.7/multidict
clang -Wno-unused-result -Wsign-compare -Wunreachable-code -fno-common -dynamic -DNDEBUG -g -fwrapv -O3 -Wall -I/usr/local/include -I/usr/local/opt/openssl/include -I/usr/local/opt/sqlite/include -I/usr/local/Cellar/python/3.7.0/Frameworks/Python.framework/Versions/3.7/include/python3.7m -c multidict/_multidict.c -o build/temp.macosx-10.11-x86_64-3.7/multidict/_multidict.o -O2 -std=c99 -Wall -Wsign-compare -Wconversion -fno-strict-aliasing -pedantic
xcrun: error: invalid active developer path (/Library/Developer/CommandLineTools), missing xcrun at: /Library/Developer/CommandLineTools/usr/bin/xcrun
error: command 'clang' failed with exit status 1
----------------------------------------
ERROR: Failed building wheel for multidict
Building wheel for yarl (setup.py) ... error
ERROR: Command errored out with exit status 1:
command: /usr/local/opt/python/bin/python3.7 -u -c 'import sys, setuptools, tokenize; sys.argv[0] = '"'"'/private/var/folders/gd/hk_mr3y15xqd49ty5xfkqjhw0000gp/T/pip-install-xoap8323/yarl/setup.py'"'"'; __file__='"'"'/private/var/folders/gd/hk_mr3y15xqd49ty5xfkqjhw0000gp/T/pip-install-xoap8323/yarl/setup.py'"'"';f=getattr(tokenize, '"'"'open'"'"', open)(__file__);code=f.read().replace('"'"'\r\n'"'"', '"'"'\n'"'"');f.close();exec(compile(code, __file__, '"'"'exec'"'"'))' bdist_wheel -d /private/var/folders/gd/hk_mr3y15xqd49ty5xfkqjhw0000gp/T/pip-wheel-xg5gzjf7
cwd: /private/var/folders/gd/hk_mr3y15xqd49ty5xfkqjhw0000gp/T/pip-install-xoap8323/yarl/
Complete output (37 lines):
**********************
* Accellerated build *
**********************
running bdist_wheel
running build
running build_py
creating build
creating build/lib.macosx-10.11-x86_64-3.7
creating build/lib.macosx-10.11-x86_64-3.7/yarl
copying yarl/__init__.py -> build/lib.macosx-10.11-x86_64-3.7/yarl
copying yarl/quoting.py -> build/lib.macosx-10.11-x86_64-3.7/yarl
running egg_info
writing yarl.egg-info/PKG-INFO
writing dependency_links to yarl.egg-info/dependency_links.txt
writing requirements to yarl.egg-info/requires.txt
writing top-level names to yarl.egg-info/top_level.txt
reading manifest file 'yarl.egg-info/SOURCES.txt'
reading manifest template 'MANIFEST.in'
warning: no previously-included files matching '*.pyc' found anywhere in distribution
warning: no previously-included files matching '*.cache' found anywhere in distribution
warning: no previously-included files found matching 'yarl/_quoting.html'
warning: no previously-included files found matching 'yarl/_quoting.*.so'
warning: no previously-included files found matching 'yarl/_quoting.pyd'
warning: no previously-included files found matching 'yarl/_quoting.*.pyd'
no previously-included directories found matching 'docs/_build'
writing manifest file 'yarl.egg-info/SOURCES.txt'
copying yarl/__init__.pyi -> build/lib.macosx-10.11-x86_64-3.7/yarl
copying yarl/_quoting.c -> build/lib.macosx-10.11-x86_64-3.7/yarl
copying yarl/_quoting.pyx -> build/lib.macosx-10.11-x86_64-3.7/yarl
copying yarl/py.typed -> build/lib.macosx-10.11-x86_64-3.7/yarl
running build_ext
building 'yarl._quoting' extension
creating build/temp.macosx-10.11-x86_64-3.7
creating build/temp.macosx-10.11-x86_64-3.7/yarl
clang -Wno-unused-result -Wsign-compare -Wunreachable-code -fno-common -dynamic -DNDEBUG -g -fwrapv -O3 -Wall -I/usr/local/include -I/usr/local/opt/openssl/include -I/usr/local/opt/sqlite/include -I/usr/local/Cellar/python/3.7.0/Frameworks/Python.framework/Versions/3.7/include/python3.7m -c yarl/_quoting.c -o build/temp.macosx-10.11-x86_64-3.7/yarl/_quoting.o
xcrun: error: invalid active developer path (/Library/Developer/CommandLineTools), missing xcrun at: /Library/Developer/CommandLineTools/usr/bin/xcrun
error: command 'clang' failed with exit status 1
----------------------------------------
ERROR: Failed building wheel for yarl
Running setup.py clean for yarl
Failed to build multidict yarl
ERROR: Could not build wheels for multidict which use PEP 517 and cannot be installed directly