WARNING: html_static_path entry '_static' does not exist

Exception occurred:
  File "/home/jon/pro/zeek/zeek/auxil/btest/sphinx/btest-sphinx.py", line 80, in run
    App.builder.info("running test %s ..." % darkgreen(self.path))
AttributeError: 'StandaloneHTMLBuilder' object has no attribute 'info'
The full traceback has been saved in /home/jon/pro/zeek/zeek/auxil/btest/testing/.tmp/sphinx-err-xayjebso.log, if you want to report the issue to the developers.
Please also report this if it was a user error, so that a better error message can be provided next time.
A bug report can be filed in the tracker at <https://github.com/sphinx-doc/sphinx/issues>. Thanks!
make[2]: *** [Makefile:47: html] Error 2
