$ remarkable
Traceback (most recent call last):
  File "/usr/bin/remarkable", line 65, in <module>
    import remarkable
  File "/usr/lib/python3/dist-packages/remarkable/__init__.py", line 30, in <module>
    from remarkable import RemarkableWindow
  File "/usr/lib/python3/dist-packages/remarkable/RemarkableWindow.py", line 26, in <module>
    gi.require_version('GtkSource', '3.0')
  File "/usr/lib64/python3.10/site-packages/gi/__init__.py", line 129, in require_version
    raise ValueError('Namespace %s not available for version %s' %
ValueError: Namespace GtkSource not available for version 3.0