When used from a Git worktree, after a fresh clone from the GitHub repository, it tries to fall back to using Subversion for guessing the revision; but we do not use Subversion anymore: Traceback (most recent call last): File "/app/webkit/Tools/glib/apply-build-revision-to-files.py", line 106, in <module> sys.exit(main(sys.argv[1:])) File "/app/webkit/Tools/glib/apply-build-revision-to-files.py", line 78, in main build_revision = get_build_revision() File "/app/webkit/Tools/glib/apply-build-revision-to-files.py", line 73, in get_build_revision revision = "r%s" % subprocess.check_output(("svnversion"), stderr=devnull).decode('utf-8').strip() File "/usr/lib/python3.9/subprocess.py", line 424, in check_output return run(*popenargs, stdout=PIPE, timeout=timeout, check=True, File "/usr/lib/python3.9/subprocess.py", line 505, in run with Popen(*popenargs, **kwargs) as process: File "/usr/lib/python3.9/subprocess.py", line 951, in __init__ self._execute_child(args, executable, preexec_fn, close_fds, File "/usr/lib/python3.9/subprocess.py", line 1821, in _execute_child raise child_exception_type(errno_num, err_msg, err_filename) FileNotFoundError: [Errno 2] No such file or directory: 'svnversion'