When using python 3.11 on debian bookworm/sid, an older version is installed. Compilation is successful, and the package works just fine, but it's a bit curious.
(.venv) user@debian:~$ pip install hfst
--- compile... ---
(.venv) user@debian:~$ pip freeze
hfst==3.12.2.4b0
(.venv) user@debian:~$ pip install hfst==3.15.0.0b0 --force-reinstall -vv
--- snip ---
ERROR: Could not find a version that satisfies the requirement hfst==3.15.0.0b0 (from versions: 3.12.0.2b0, 3.12.1.0b0, 3.12.1.1b0, 3.12.2.2b0, 3.12.2.3b0, 3.12.2.4b0)
ERROR: No matching distribution found for hfst==3.15.0.0b0