textproc/py-sphinx causes filesystem violations

From: Thierry Thomas <thierry_at_freebsd.org>
Date: Thu, 30 Mar 2023 12:39:26 UTC
Hello,

I’m trying to upgrade a simple port, math/py-fpylll; it requires
textproc/py-sphinx to build the doc, and now it fails in poudriere with
these errors:

=>> Checking for filesystem violations... done
=>> Error: Filesystem touched during build:
extra: usr/local/lib/python3.9/site-packages/packaging/__pycache__
extra: usr/local/lib/python3.9/site-packages/sphinx/directives/__pycache__
extra: usr/local/lib/python3.9/site-packages/sphinx/pycode/__pycache__
extra: usr/local/lib/python3.9/site-packages/sphinx/cmd/__pycache__
extra: usr/local/lib/python3.9/site-packages/sphinx/locale/__pycache__
extra: usr/local/lib/python3.9/site-packages/sphinx/ext/__pycache__
extra: usr/local/lib/python3.9/site-packages/sphinx/ext/autodoc/__pycache__
extra: usr/local/lib/python3.9/site-packages/sphinx/testing/__pycache__
extra: usr/local/lib/python3.9/site-packages/sphinx/__pycache__
extra: usr/local/lib/python3.9/site-packages/sphinx/domains/__pycache__
extra: usr/local/lib/python3.9/site-packages/sphinx/environment/adapters/__pycache__
extra: usr/local/lib/python3.9/site-packages/sphinx/environment/__pycache__
extra: usr/local/lib/python3.9/site-packages/sphinx/environment/collectors/__pycache__
extra: usr/local/lib/python3.9/site-packages/sphinx/builders/html/__pycache__
extra: usr/local/lib/python3.9/site-packages/sphinx/builders/latex/__pycache__
extra: usr/local/lib/python3.9/site-packages/sphinx/builders/__pycache__
extra: usr/local/lib/python3.9/site-packages/sphinx/transforms/__pycache__
extra: usr/local/lib/python3.9/site-packages/sphinx/transforms/post_transforms/__pycache__
extra: usr/local/lib/python3.9/site-packages/sphinx/util/__pycache__
extra: usr/local/lib/python3.9/site-packages/sphinx/search/__pycache__
extra: usr/local/lib/python3.9/site-packages/sphinx/writers/__pycache__
build of math/py-fpylll | py39-fpylll-0.5.9 ended at Thu Mar 30 14:32:44 CEST 2023
build time: 00:02:07
!!! build failure encountered !!!
[00:10:22] Error: Build failed in phase: build_fs_violation

How to solve this problem?
-- 
Th. Thomas.