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This package requires python-cairo but that isn't listed as a dependency

Added. Thanks

This package requires python-cairo but that isn't listed as a dependency

The module gi comes with python-gobject. Hard to say what is wrong up with your setup.

Make sure there is a directory /usr/lib/python3.8/site-packages/gi and try to reinstall python-gobject?

$ python3 -m volctl
Traceback (most recent call last):
  File "/home/ryan/.local/share/pyenv/versions/3.8.0/lib/python3.8/runpy.py", line 192, in _run_module_as_main
    return _run_code(code, main_globals, None,
  File "/home/ryan/.local/share/pyenv/versions/3.8.0/lib/python3.8/runpy.py", line 85, in _run_code
    exec(code, run_globals)
  File "/home/ryan/.local/share/pyenv/versions/3.8.0/lib/python3.8/site-packages/volctl/__main__.py", line 15, in <module>
    main()
  File "/home/ryan/.local/share/pyenv/versions/3.8.0/lib/python3.8/site-packages/volctl/__main__.py", line 6, in main
    import gi
ModuleNotFoundError: No module named 'gi'

I'm getting the error DistributionNotFound: The 'volctl==0.6.2' distribution was not found and is required by the application. Any idea as for why?

Smells like you recently upgraded to Python 3.8 and volctl is still installed for 3.7? Try reinstalling volctl.

I'm getting the error DistributionNotFound: The 'volctl==0.6.2' distribution was not found and is required by the application. Any idea as for why?

Output of $ volctl:

Traceback (most recent call last): File "/usr/bin/volctl", line 6, in <module> from pkg_resources import load_entry_point File "/usr/lib/python3.8/site-packages/pkg_resources/__init__.py", line 3252, in <module> def _initialize_master_working_set(): File "/usr/lib/python3.8/site-packages/pkg_resources/__init__.py", line 3235, in _call_aside f(*args, **kwargs) File "/usr/lib/python3.8/site-packages/pkg_resources/__init__.py", line 3264, in _initialize_master_working_set working_set = WorkingSet._build_master() File "/usr/lib/python3.8/site-packages/pkg_resources/__init__.py", line 583, in _build_master ws.require(__requires__) File "/usr/lib/python3.8/site-packages/pkg_resources/__init__.py", line 900, in require needed = self.resolve(parse_requirements(requirements)) File "/usr/lib/python3.8/site-packages/pkg_resources/__init__.py", line 786, in resolve raise DistributionNotFound(req, requirers) pkg_resources.DistributionNotFound: The 'volctl==0.6.2' distribution was not found and is required by the application

This package requires python-setuptools to be installed but does not declare this dependency.

Thanks for the feedback!

I wasn't aware of this.

Few comments about the PKGBUILD.
* Per guideline empty vars should be removed.
* The install file isn't needed anymore. Since pacman5 and its hook support made it obsolete. desktop-file-utils includes now a hook, which does the update, whenever a package installs a file there.