bug#75623: Solfege error: Namespace Gtk not available

[wakyct--- via Bug reports for GNU Guix]

hello, running Solfege returns the error (it is the same for the newest 
version, this error was after downgrading one version)

george@dunstan ~/work/guix$ solfege
Traceback (most recent call last):
  File 
"/gnu/store/wlvwcmfwhh4v6halfsf405srarkl8j5f-solfege-3.23.5pre1/bin/.solfege-real", 
line 50, in <module>
    from solfege import presetup
  File 
"/gnu/store/wlvwcmfwhh4v6halfsf405srarkl8j5f-solfege-3.23.5pre1/share/solfege/solfege/presetup.py",
 line 26, in <module>
    gi.require_version("Gtk", "3.0")
  File 
"/gnu/store/qfi7wq01fifhsr21871xw4rn1ic0hvm5-python-pygobject-3.47.0/lib/python3.10/site-packages/gi/__init__.py",
 line 122, in require_version
    raise ValueError('Namespace %s not available' % namespace)

I tried downgrading the source version again but still got

Traceback (most recent call last):
  File 
"/gnu/store/6ng4hhcckwss4akk2yl43750llqvk2s8-solfege-3.23.4/bin/.solfege-real", line 
50, in <module>
    from solfege import presetup
  File 
"/gnu/store/6ng4hhcckwss4akk2yl43750llqvk2s8-solfege-3.23.4/share/solfege/solfege/presetup.py",
 line 26, in <module>
    gi.require_version("Gtk", "3.0")
  File 
"/gnu/store/qfi7wq01fifhsr21871xw4rn1ic0hvm5-python-pygobject-3.47.0/lib/python3.10/site-packages/gi/__init__.py",
 line 122, in require_version
    raise ValueError('Namespace %s not available' % namespace)
ValueError: Namespace Gtk not available

Sorry I don't understand packages very well, surely this package is not asking 
for exactly version 3.0 of Gtk?


thanks for any advice, George