Namespace Gtk4LayerShell not available

[K0-RR]

This is on LinuxMint, with gtk4-layer-shell built from source. gtk4-layer-shell works fine.
ignis systeminfo

Traceback (most recent call last):
  File "/home/radek/.local/bin/ignis", line 3, in <module>
    from ignis.main import main
  File "/home/radek/.local/share/pipx/venvs/ignis/lib/python3.12/site-packages/ignis/__init__.py", line 148, in <module>
    _init()
  File "/home/radek/.local/share/pipx/venvs/ignis/lib/python3.12/site-packages/ignis/__init__.py", line 143, in _init
    _require_versions()
  File "/home/radek/.local/share/pipx/venvs/ignis/lib/python3.12/site-packages/ignis/__init__.py", line 126, in _require_versions
    gi.require_version("Gtk4LayerShell", "1.0")
  File "/home/radek/.local/share/pipx/venvs/ignis/lib/python3.12/site-packages/gi/__init__.py", line 132, in require_version
    raise ValueError(f"Namespace {namespace} not available")
ValueError: Namespace Gtk4LayerShell not available