[Python-modules-team] Bug#972722: pyvows: ftbfs with python 3.9

[Michael Hudson-Doyle]

Source: pyvows
Version: 3.0.0-3
Severity: serious
Tags: upstream ftbfs
Justification: fails to build from source
User: debian-python at lists.debian.org
Usertags: python3.9

Dear Maintainer,

Now that python 3.9 is a supported version in unstable the build fails
in the following slightly alarming way:

dh_auto_test: warning: Compatibility levels before 10 are deprecated (level 9 in use)
I: pybuild base:217: python3.9 pyvows/cli.py tests/
<frozen importlib._bootstrap>:228: RuntimeWarning: greenlet.greenlet size changed, may indicate binary incompatibility. Expected 144 from C header, got 152 from PyObject
<frozen importlib._bootstrap>:228: RuntimeWarning: greenlet.greenlet size changed, may indicate binary incompatibility. Expected 144 from C header, got 152 from PyObject
<frozen importlib._bootstrap>:228: RuntimeWarning: greenlet.greenlet size changed, may indicate binary incompatibility. Expected 144 from C header, got 152 from PyObject
<frozen importlib._bootstrap>:228: RuntimeWarning: greenlet.greenlet size changed, may indicate binary incompatibility. Expected 144 from C header, got 152 from PyObject
<frozen importlib._bootstrap>:228: RuntimeWarning: greenlet.greenlet size changed, may indicate binary incompatibility. Expected 144 from C header, got 152 from PyObject
<frozen importlib._bootstrap>:228: RuntimeWarning: greenlet.greenlet size changed, may indicate binary incompatibility. Expected 144 from C header, got 152 from PyObject
<frozen importlib._bootstrap>:228: RuntimeWarning: greenlet.greenlet size changed, may indicate binary incompatibility. Expected 144 from C header, got 152 from PyObject
<frozen importlib._bootstrap>:228: RuntimeWarning: greenlet.greenlet size changed, may indicate binary incompatibility. Expected 144 from C header, got 152 from PyObject
Segmentation fault (core dumped)
E: pybuild pybuild:352: test: plugin custom failed with: exit code=139: python3.9 pyvows/cli.py tests/

Cheers,
mwh

-- System Information:
Debian Release: bullseye/sid
  APT prefers focal-updates
  APT policy: (500, 'focal-updates'), (500, 'focal-security'), (500, 'focal'), (400, 'focal-proposed'), (100, 'focal-backports')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 5.4.0-51-generic (SMP w/8 CPU cores)
Kernel taint flags: TAINT_PROPRIETARY_MODULE, TAINT_OOT_MODULE
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8), LANGUAGE=en_US.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /usr/bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled