sip 6.3.0 fails to build pyqt5 5.15.4

[مهدي شينون]

This is the GPL version of PyQt 5.15.4 (licensed under the GNU General 
Public License) for Python 3.9.7 on linux.
Found the license file 'pyqt-gpl.sip'.
Checking to see if the QtCore bindings can be built...
sip-install: An internal error occurred...
Traceback (most recent call last):
File "/app/bin/sip-install", line 8, in <module>
sys.exit(main())
File "/app/lib/python3.9/site-packages/sipbuild/tools/install.py", line 
37, in main
handle_exception(e)
File "/app/lib/python3.9/site-packages/sipbuild/exceptions.py", line 81, 
in handle_exception
raise e
File "/app/lib/python3.9/site-packages/sipbuild/tools/install.py", line 
32, in main
project = AbstractProject.bootstrap('install',
File "/app/lib/python3.9/site-packages/sipbuild/abstract_project.py", 
line 83, in bootstrap
project.setup(pyproject, tool, tool_description)
File "/app/lib/python3.9/site-packages/sipbuild/project.py", line 545, 
in setup
self.update(tool)
File "project.py", line 182, in update
File "/app/lib/python3.9/site-packages/sipbuild/project.py", line 566, 
in update
self.update_buildable_bindings()
File "/app/lib/python3.9/site-packages/sipbuild/project.py", line 578, 
in update_buildable_bindings
if not b.is_buildable():
File "/app/lib/python3.9/site-packages/pyqtbuild/bindings.py", line 171, 
in is_buildable
test_exe = project.builder.build_executable(buildable, fatal=False)
File "/app/lib/python3.9/site-packages/pyqtbuild/builder.py", line 169, 
in build_executable
self._update_pro_file(pro_lines, buildable)
File "/app/lib/python3.9/site-packages/pyqtbuild/builder.py", line 687, 
in _update_pro_file
if self.project.get_platform_tag().endswith('_universal2'):
File "/app/lib/python3.9/site-packages/pyqtbuild/project.py", line 138, 
in get_platform_tag
platform_tag = super().get_platform_tag().split('_')
File "/app/lib/python3.9/site-packages/sipbuild/project.py", line 339, 
in get_platform_tag
if self.minimum_glibc_version > (2, 17):
TypeError: '>' not supported between instances of 'str' and 'tuple'
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