The last bugfix release of sip 4 was in February 2018, 5 years ago. Even sip 5 is now unsupported. It should be safe to remove the parallel build system for sip 4 in favor of the sip 5/6 build system defined in pyproject.toml and project.py, avoiding the need to maintain two build systems in parallel.
The last bugfix release of sip 4 was in February 2018, 5 years ago. Even sip 5 is now unsupported. It should be safe to remove the parallel build system for sip 4 in favor of the sip 5/6 build system defined in pyproject.toml and project.py, avoiding the need to maintain two build systems in parallel.