Add support for MacOSC

[grzanka]

Leszeks-MacBook-Air:~ grzanka$ python3 -V
Python 3.8.2
Leszeks-MacBook-Air:~ grzanka$ python3 -m venv /Users/grzanka/tmp/1
Leszeks-MacBook-Air:~ grzanka$ source tmp/1/bin/activate
(1) Leszeks-MacBook-Air:~ grzanka$ pip install pytrip98gui
Collecting pytrip98gui
  Downloading https://files.pythonhosted.org/packages/b4/89/48a771822caeaa015d9be38b7d6d7986da1f452256c41d614480429cf95d/pytrip98gui-1.2.0-py3-none-any.whl (609kB)
     |████████████████████████████████| 614kB 2.4MB/s 
Collecting PyQt5>=5.15; python_version >= "3.8" (from pytrip98gui)
  Downloading https://files.pythonhosted.org/packages/8e/a4/d5e4bf99dd50134c88b95e926d7b81aad2473b47fde5e3e4eac2c69a8942/PyQt5-5.15.4.tar.gz (3.3MB)
     |████████████████████████████████| 3.3MB 14.2MB/s 
  Installing build dependencies ... done
  Getting requirements to build wheel ... done
    Preparing wheel metadata ... error
    ERROR: Command errored out with exit status 1:
     command: /Users/grzanka/tmp/1/bin/python3 /Users/grzanka/tmp/1/lib/python3.8/site-packages/pip/_vendor/pep517/_in_process.py prepare_metadata_for_build_wheel /var/folders/5z/b4c5p4590qb2w83r5h3z76p00000gn/T/tmpp6vtkq9p
         cwd: /private/var/folders/5z/b4c5p4590qb2w83r5h3z76p00000gn/T/pip-install-a8e8mp77/PyQt5
    Complete output (31 lines):
    Traceback (most recent call last):
      File "/Users/grzanka/tmp/1/lib/python3.8/site-packages/pip/_vendor/pep517/_in_process.py", line 64, in prepare_metadata_for_build_wheel
        hook = backend.prepare_metadata_for_build_wheel
    AttributeError: module 'sipbuild.api' has no attribute 'prepare_metadata_for_build_wheel'
    
    During handling of the above exception, another exception occurred:
    
    Traceback (most recent call last):
      File "/Users/grzanka/tmp/1/lib/python3.8/site-packages/pip/_vendor/pep517/_in_process.py", line 207, in <module>
        main()
      File "/Users/grzanka/tmp/1/lib/python3.8/site-packages/pip/_vendor/pep517/_in_process.py", line 197, in main
        json_out['return_val'] = hook(**hook_input['kwargs'])
      File "/Users/grzanka/tmp/1/lib/python3.8/site-packages/pip/_vendor/pep517/_in_process.py", line 66, in prepare_metadata_for_build_wheel
        return _get_wheel_metadata_from_wheel(backend, metadata_directory,
      File "/Users/grzanka/tmp/1/lib/python3.8/site-packages/pip/_vendor/pep517/_in_process.py", line 95, in _get_wheel_metadata_from_wheel
        whl_basename = backend.build_wheel(metadata_directory, config_settings)
      File "/private/var/folders/5z/b4c5p4590qb2w83r5h3z76p00000gn/T/pip-build-env-o8rg_8rp/overlay/lib/python3.8/site-packages/sipbuild/api.py", line 51, in build_wheel
        project = AbstractProject.bootstrap('pep517')
      File "/private/var/folders/5z/b4c5p4590qb2w83r5h3z76p00000gn/T/pip-build-env-o8rg_8rp/overlay/lib/python3.8/site-packages/sipbuild/abstract_project.py", line 83, in bootstrap
        project.setup(pyproject, tool, tool_description)
      File "/private/var/folders/5z/b4c5p4590qb2w83r5h3z76p00000gn/T/pip-build-env-o8rg_8rp/overlay/lib/python3.8/site-packages/sipbuild/project.py", line 484, in setup
        self.apply_user_defaults(tool)
      File "project.py", line 63, in apply_user_defaults
        super().apply_user_defaults(tool)
      File "/private/var/folders/5z/b4c5p4590qb2w83r5h3z76p00000gn/T/pip-build-env-o8rg_8rp/overlay/lib/python3.8/site-packages/pyqtbuild/project.py", line 70, in apply_user_defaults
        super().apply_user_defaults(tool)
      File "/private/var/folders/5z/b4c5p4590qb2w83r5h3z76p00000gn/T/pip-build-env-o8rg_8rp/overlay/lib/python3.8/site-packages/sipbuild/project.py", line 230, in apply_user_defaults
        self.builder.apply_user_defaults(tool)
      File "/private/var/folders/5z/b4c5p4590qb2w83r5h3z76p00000gn/T/pip-build-env-o8rg_8rp/overlay/lib/python3.8/site-packages/pyqtbuild/builder.py", line 66, in apply_user_defaults
        raise PyProjectOptionException('qmake',
    sipbuild.pyproject.PyProjectOptionException
    ----------------------------------------
ERROR: Command errored out with exit status 1: /Users/grzanka/tmp/1/bin/python3 /Users/grzanka/tmp/1/lib/python3.8/site-packages/pip/_vendor/pep517/_in_process.py prepare_metadata_for_build_wheel /var/folders/5z/b4c5p4590qb2w83r5h3z76p00000gn/T/tmpp6vtkq9p Check the logs for full command output.
WARNING: You are using pip version 19.2.3, however version 21.2.4 is available.
You should consider upgrading via the 'pip install --upgrade pip' command.
(1) Leszeks-MacBook-Air:~ grzanka$