Python “如何修复”；无法为使用PEP 517的sip构建控制盘；越狱iOS出错？

我正在安装python3.7的越狱iOS上，并尝试使用

pip3安装PyQt5

进行安装，但是，我收到错误消息说

无法为使用PEP 517的sip构建控制盘，并且无法直接安装。以下是完整的日志：

>>>>>pip3 install PyQt5
 
 
Collecting PyQt5
  Using cached PyQt5-5.15.1.tar.gz (3.3 MB)
  Installing build dependencies ... error
  ERROR: Command errored out with exit status 1:
   command: /usr/bin/python3 /usr/lib/python3.7/site-packages/pip install --ignore-installed --no-user --prefix /private/var/tmp/pip-build-env-h8s_4u1b/overlay --no-warn-script-location --no-binary :none: --only-binary :none: -i https://pypi.org/simple -- 'sip >=5.3, <7' 'PyQt-builder >=1.1.0, <2'
       cwd: None
  Complete output (162 lines):
  Collecting sip<7,>=5.3
    Using cached sip-5.4.0.tar.gz (1.1 MB)
    Installing build dependencies: started
    Installing build dependencies: finished with status 'done'
    Getting requirements to build wheel: started
    Getting requirements to build wheel: finished with status 'done'
      Preparing wheel metadata: started
      Preparing wheel metadata: finished with status 'done'
  Collecting PyQt-builder<2,>=1.1.0
    Using cached PyQt_builder-1.5.0-py3-none-any.whl (5.5 MB)
  Collecting toml
    Using cached toml-0.10.1-py2.py3-none-any.whl (19 kB)
  Collecting packaging
    Using cached packaging-20.4-py2.py3-none-any.whl (37 kB)
  Collecting pyparsing>=2.0.2
    Using cached pyparsing-2.4.7-py2.py3-none-any.whl (67 kB)
  Collecting six
    Using cached six-1.15.0-py2.py3-none-any.whl (10 kB)
  Building wheels for collected packages: sip
    Building wheel for sip (PEP 517): started
    Building wheel for sip (PEP 517): finished with status 'error'
    ERROR: Command errored out with exit status 1:
     command: /usr/bin/python3 /usr/lib/python3.7/site-packages/pip/_vendor/pep517/_in_process.py build_wheel /tmp/tmpxa3ln0f1
         cwd: /private/var/tmp/pip-install-6cjj0vgv/sip
    Complete output (133 lines):
    running bdist_wheel
    running build
    running build_py
    creating build
    creating build/lib.macosx-10.14-iPhone10,6-3.7
    creating build/lib.macosx-10.14-iPhone10,6-3.7/sipbuild
    copying sipbuild/distutils_builder.py -> build/lib.macosx-10.14-iPhone10,6-3.7/sipbuild
    copying sipbuild/py_versions.py -> build/lib.macosx-10.14-iPhone10,6-3.7/sipbuild
    copying sipbuild/installable.py -> build/lib.macosx-10.14-iPhone10,6-3.7/sipbuild
    copying sipbuild/version.py -> build/lib.macosx-10.14-iPhone10,6-3.7/sipbuild
    copying sipbuild/pyproject.py -> build/lib.macosx-10.14-iPhone10,6-3.7/sipbuild
    copying sipbuild/configurable.py -> build/lib.macosx-10.14-iPhone10,6-3.7/sipbuild
    copying sipbuild/__init__.py -> build/lib.macosx-10.14-iPhone10,6-3.7/sipbuild
    copying sipbuild/builder.py -> build/lib.macosx-10.14-iPhone10,6-3.7/sipbuild
    copying sipbuild/buildable.py -> build/lib.macosx-10.14-iPhone10,6-3.7/sipbuild
    copying sipbuild/api.py -> build/lib.macosx-10.14-iPhone10,6-3.7/sipbuild
    copying sipbuild/abstract_project.py -> build/lib.macosx-10.14-iPhone10,6-3.7/sipbuild
    copying sipbuild/bindings.py -> build/lib.macosx-10.14-iPhone10,6-3.7/sipbuild
    copying sipbuild/exceptions.py -> build/lib.macosx-10.14-iPhone10,6-3.7/sipbuild
    copying sipbuild/helpers.py -> build/lib.macosx-10.14-iPhone10,6-3.7/sipbuild
    copying sipbuild/abstract_builder.py -> build/lib.macosx-10.14-iPhone10,6-3.7/sipbuild
    copying sipbuild/project.py -> build/lib.macosx-10.14-iPhone10,6-3.7/sipbuild
    copying sipbuild/argument_parser.py -> build/lib.macosx-10.14-iPhone10,6-3.7/sipbuild
    creating build/lib.macosx-10.14-iPhone10,6-3.7/sipbuild/tools
    copying sipbuild/tools/build.py -> build/lib.macosx-10.14-iPhone10,6-3.7/sipbuild/tools
    copying sipbuild/tools/__init__.py -> build/lib.macosx-10.14-iPhone10,6-3.7/sipbuild/tools
    copying sipbuild/tools/sdist.py -> build/lib.macosx-10.14-iPhone10,6-3.7/sipbuild/tools
    copying sipbuild/tools/install.py -> build/lib.macosx-10.14-iPhone10,6-3.7/sipbuild/tools
    copying sipbuild/tools/wheel.py -> build/lib.macosx-10.14-iPhone10,6-3.7/sipbuild/tools
    creating build/lib.macosx-10.14-iPhone10,6-3.7/sipbuild/module
    copying sipbuild/module/__init__.py -> build/lib.macosx-10.14-iPhone10,6-3.7/sipbuild/module
    copying sipbuild/module/abi_version.py -> build/lib.macosx-10.14-iPhone10,6-3.7/sipbuild/module
    copying sipbuild/module/module.py -> build/lib.macosx-10.14-iPhone10,6-3.7/sipbuild/module
    copying sipbuild/module/main.py -> build/lib.macosx-10.14-iPhone10,6-3.7/sipbuild/module
    creating build/lib.macosx-10.14-iPhone10,6-3.7/sipbuild/legacy
    copying sipbuild/legacy/sip5.py -> build/lib.macosx-10.14-iPhone10,6-3.7/sipbuild/legacy
    copying sipbuild/legacy/__init__.py -> build/lib.macosx-10.14-iPhone10,6-3.7/sipbuild/legacy
    creating build/lib.macosx-10.14-iPhone10,6-3.7/sipbuild/distinfo
    copying sipbuild/distinfo/__init__.py -> build/lib.macosx-10.14-iPhone10,6-3.7/sipbuild/distinfo
    copying sipbuild/distinfo/distinfo.py -> build/lib.macosx-10.14-iPhone10,6-3.7/sipbuild/distinfo
    copying sipbuild/distinfo/main.py -> build/lib.macosx-10.14-iPhone10,6-3.7/sipbuild/distinfo
    creating build/lib.macosx-10.14-iPhone10,6-3.7/sipbuild/module/source
    creating build/lib.macosx-10.14-iPhone10,6-3.7/sipbuild/module/source/12.8
    copying sipbuild/module/source/12.8/voidptr.c -> build/lib.macosx-10.14-iPhone10,6-3.7/sipbuild/module/source/12.8
    copying sipbuild/module/source/12.8/sip.pyi -> build/lib.macosx-10.14-iPhone10,6-3.7/sipbuild/module/source/12.8
    copying sipbuild/module/source/12.8/objmap.c -> build/lib.macosx-10.14-iPhone10,6-3.7/sipbuild/module/source/12.8
    copying sipbuild/module/source/12.8/array.c -> build/lib.macosx-10.14-iPhone10,6-3.7/sipbuild/module/source/12.8
    copying sipbuild/module/source/12.8/int_convertors.c -> build/lib.macosx-10.14-iPhone10,6-3.7/sipbuild/module/source/12.8
    copying sipbuild/module/source/12.8/sip.h.in -> build/lib.macosx-10.14-iPhone10,6-3.7/sipbuild/module/source/12.8
    copying sipbuild/module/source/12.8/pyproject.toml -> build/lib.macosx-10.14-iPhone10,6-3.7/sipbuild/module/source/12.8
    copying sipbuild/module/source/12.8/README.in -> build/lib.macosx-10.14-iPhone10,6-3.7/sipbuild/module/source/12.8
    copying sipbuild/module/source/12.8/apiversions.c -> build/lib.macosx-10.14-iPhone10,6-3.7/sipbuild/module/source/12.8
    copying sipbuild/module/source/12.8/siplib.c -> build/lib.macosx-10.14-iPhone10,6-3.7/sipbuild/module/source/12.8
    copying sipbuild/module/source/12.8/array.h -> build/lib.macosx-10.14-iPhone10,6-3.7/sipbuild/module/source/12.8
    copying sipbuild/module/source/12.8/setup.cfg.in -> build/lib.macosx-10.14-iPhone10,6-3.7/sipbuild/module/source/12.8
    copying sipbuild/module/source/12.8/sip.rst.in -> build/lib.macosx-10.14-iPhone10,6-3.7/sipbuild/module/source/12.8
    copying sipbuild/module/source/12.8/descriptors.c -> build/lib.macosx-10.14-iPhone10,6-3.7/sipbuild/module/source/12.8
    copying sipbuild/module/source/12.8/qtlib.c -> build/lib.macosx-10.14-iPhone10,6-3.7/sipbuild/module/source/12.8
    copying sipbuild/module/source/12.8/MANIFEST.in -> build/lib.macosx-10.14-iPhone10,6-3.7/sipbuild/module/source/12.8
    copying sipbuild/module/source/12.8/bool.cpp -> build/lib.macosx-10.14-iPhone10,6-3.7/sipbuild/module/source/12.8
    copying sipbuild/module/source/12.8/threads.c -> build/lib.macosx-10.14-iPhone10,6-3.7/sipbuild/module/source/12.8
    copying sipbuild/module/source/12.8/setup.py.in -> build/lib.macosx-10.14-iPhone10,6-3.7/sipbuild/module/source/12.8
    copying sipbuild/module/source/12.8/sipint.h -> build/lib.macosx-10.14-iPhone10,6-3.7/sipbuild/module/source/12.8
    creating build/lib.macosx-10.14-iPhone10,6-3.7/sipbuild/module/source/12.7
    copying sipbuild/module/source/12.7/voidptr.c -> build/lib.macosx-10.14-iPhone10,6-3.7/sipbuild/module/source/12.7
    copying sipbuild/module/source/12.7/sip.pyi -> build/lib.macosx-10.14-iPhone10,6-3.7/sipbuild/module/source/12.7
    copying sipbuild/module/source/12.7/objmap.c -> build/lib.macosx-10.14-iPhone10,6-3.7/sipbuild/module/source/12.7
    copying sipbuild/module/source/12.7/array.c -> build/lib.macosx-10.14-iPhone10,6-3.7/sipbuild/module/source/12.7
    copying sipbuild/module/source/12.7/int_convertors.c -> build/lib.macosx-10.14-iPhone10,6-3.7/sipbuild/module/source/12.7
    copying sipbuild/module/source/12.7/sip.h.in -> build/lib.macosx-10.14-iPhone10,6-3.7/sipbuild/module/source/12.7
    copying sipbuild/module/source/12.7/pyproject.toml -> build/lib.macosx-10.14-iPhone10,6-3.7/sipbuild/module/source/12.7
    copying sipbuild/module/source/12.7/README.in -> build/lib.macosx-10.14-iPhone10,6-3.7/sipbuild/module/source/12.7
    copying sipbuild/module/source/12.7/apiversions.c -> build/lib.macosx-10.14-iPhone10,6-3.7/sipbuild/module/source/12.7
    copying sipbuild/module/source/12.7/siplib.c -> build/lib.macosx-10.14-iPhone10,6-3.7/sipbuild/module/source/12.7
    copying sipbuild/module/source/12.7/array.h -> build/lib.macosx-10.14-iPhone10,6-3.7/sipbuild/module/source/12.7
    copying sipbuild/module/source/12.7/setup.cfg.in -> build/lib.macosx-10.14-iPhone10,6-3.7/sipbuild/module/source/12.7
    copying sipbuild/module/source/12.7/sip.rst.in -> build/lib.macosx-10.14-iPhone10,6-3.7/sipbuild/module/source/12.7
    copying sipbuild/module/source/12.7/descriptors.c -> build/lib.macosx-10.14-iPhone10,6-3.7/sipbuild/module/source/12.7
    copying sipbuild/module/source/12.7/qtlib.c -> build/lib.macosx-10.14-iPhone10,6-3.7/sipbuild/module/source/12.7
    copying sipbuild/module/source/12.7/MANIFEST.in -> build/lib.macosx-10.14-iPhone10,6-3.7/sipbuild/module/source/12.7
    copying sipbuild/module/source/12.7/bool.cpp -> build/lib.macosx-10.14-iPhone10,6-3.7/sipbuild/module/source/12.7
    copying sipbuild/module/source/12.7/threads.c -> build/lib.macosx-10.14-iPhone10,6-3.7/sipbuild/module/source/12.7
    copying sipbuild/module/source/12.7/setup.py.in -> build/lib.macosx-10.14-iPhone10,6-3.7/sipbuild/module/source/12.7
    copying sipbuild/module/source/12.7/sipint.h -> build/lib.macosx-10.14-iPhone10,6-3.7/sipbuild/module/source/12.7
    running build_ext
    Traceback (most recent call last):
      File "/usr/lib/python3.7/site-packages/pip/_vendor/pep517/_in_process.py", line 280, in <module>
        main()
      File "/usr/lib/python3.7/site-packages/pip/_vendor/pep517/_in_process.py", line 263, in main
        json_out['return_val'] = hook(**hook_input['kwargs'])
      File "/usr/lib/python3.7/site-packages/pip/_vendor/pep517/_in_process.py", line 205, in build_wheel
        metadata_directory)
      File "/private/var/tmp/pip-build-env-al8vajih/overlay/lib/python3.7/site-packages/setuptools/build_meta.py", line 217, in build_wheel
        wheel_directory, config_settings)
      File "/private/var/tmp/pip-build-env-al8vajih/overlay/lib/python3.7/site-packages/setuptools/build_meta.py", line 202, in _build_with_temp_dir
        self.run_setup()
      File "/private/var/tmp/pip-build-env-al8vajih/overlay/lib/python3.7/site-packages/setuptools/build_meta.py", line 254, in run_setup
        self).run_setup(setup_script=setup_script)
      File "/private/var/tmp/pip-build-env-al8vajih/overlay/lib/python3.7/site-packages/setuptools/build_meta.py", line 145, in run_setup
        exec(compile(code, __file__, 'exec'), locals())
      File "setup.py", line 68, in <module>
        'sip5 = sipbuild.legacy.sip5:main']
      File "/private/var/tmp/pip-build-env-al8vajih/overlay/lib/python3.7/site-packages/setuptools/__init__.py", line 153, in setup
        return distutils.core.setup(**attrs)
      File "/usr/lib/python3.7/distutils/core.py", line 148, in setup
        dist.run_commands()
      File "/usr/lib/python3.7/distutils/dist.py", line 966, in run_commands
        self.run_command(cmd)
      File "/usr/lib/python3.7/distutils/dist.py", line 985, in run_command
        cmd_obj.run()
      File "/private/var/tmp/pip-build-env-al8vajih/overlay/lib/python3.7/site-packages/wheel/bdist_wheel.py", line 290, in run
        self.run_command('build')
      File "/usr/lib/python3.7/distutils/cmd.py", line 313, in run_command
        self.distribution.run_command(command)
      File "/usr/lib/python3.7/distutils/dist.py", line 985, in run_command
        cmd_obj.run()
      File "/usr/lib/python3.7/distutils/command/build.py", line 135, in run
        self.run_command(cmd_name)
      File "/usr/lib/python3.7/distutils/cmd.py", line 313, in run_command
        self.distribution.run_command(command)
      File "/usr/lib/python3.7/distutils/dist.py", line 985, in run_command
        cmd_obj.run()
      File "/private/var/tmp/pip-build-env-al8vajih/overlay/lib/python3.7/site-packages/setuptools/command/build_ext.py", line 79, in run
        _build_ext.run(self)
      File "/usr/lib/python3.7/distutils/command/build_ext.py", line 310, in run
        customize_compiler(self.compiler)
      File "/usr/lib/python3.7/distutils/sysconfig.py", line 183, in customize_compiler
        _osx_support.customize_compiler(_config_vars)
      File "/usr/lib/python3.7/_osx_support.py", line 418, in customize_compiler
        _find_appropriate_compiler(_config_vars)
      File "/usr/lib/python3.7/_osx_support.py", line 191, in _find_appropriate_compiler
        "Cannot locate working compiler")
    SystemError: Cannot locate working compiler
    ----------------------------------------
    ERROR: Failed building wheel for sip
  Failed to build sip
  ERROR: Could not build wheels for sip which use PEP 517 and cannot be installed directly
  ----------------------------------------
ERROR: Command errored out with exit status 1: /usr/bin/python3 /usr/lib/python3.7/site-packages/pip install --ignore-installed --no-user --prefix /private/var/tmp/pip-build-env-h8s_4u1b/overlay --no-warn-script-location --no-binary :none: --only-binary :none: -i https://pypi.org/simple -- 'sip >=5.3, <7' 'PyQt-builder >=1.1.0, <2' Check the logs for full command output.

>>>>pip3安装PyQt5
收集PyQt5
使用缓存的PyQt5-5.15.1.tar.gz（3.3MB）
正在安装生成依赖项。。。错误
错误：命令出错，退出状态为1:
命令：/usr/bin/python3/usr/lib/python3.7/site-packages/pip安装--忽略已安装--无用户--前缀/private/var/tmp/pip-build-env-h8s_4u1b/overlay--无警告脚本位置--无二进制文件：无：-仅二进制文件：无：-ihttps://pypi.org/simple --“sip>=5.3，=1.1.0，=5.3，=1.1.0，错误包括：
SystemError:找不到正在工作的编译器