make lazy-extractors fails

[royale1223]

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• You will be asked some questions and requested to provide some information, please read them carefully and answer honestly
• Put an x into all the boxes [ ] relevant to your issue (like this: [x])
• Use the Preview tab to see what your issue will actually look like

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Make sure you are using the latest version: run youtube-dl --version and ensure your version is 2018.09.18. If it's not, read this FAQ entry and update. Issues with outdated version will be rejected.

• [x ] I've verified and I assure that I'm running youtube-dl 2018.09.18

Before submitting an issue make sure you have:

• [x ] At least skimmed through the README, most notably the FAQ and BUGS sections
• [x ] Searched the bugtracker for similar issues including closed ones
• Checked that provided video/audio/playlist URLs (if any) are alive and playable in a browser

What is the purpose of your issue?

• [x ] Bug report (encountered problems with youtube-dl)
• Site support request (request for adding support for a new site)
• Feature request (request for a new functionality)
• Question
• Other

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The following sections concretize particular purposed issues, you can erase any section (the contents between triple ---) not applicable to your issue

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If the purpose of this issue is a bug report, site support request or you are not completely sure provide the full verbose output as follows:

make lazy-extractors 
/usr/bin/env python devscripts/make_lazy_extractors.py youtube_dl/extractor/lazy_extractors.py
WARNING: Lazy loading extractors is an experimental feature that may not always work
Traceback (most recent call last):
  File "devscripts/make_lazy_extractors.py", line 89, in <module>
    src = build_lazy_ie(ie, name)
  File "devscripts/make_lazy_extractors.py", line 57, in build_lazy_ie
    s += '\n' + getsource(ie.suitable)
  File "/usr/lib/python2.7/inspect.py", line 700, in getsource
    lines, lnum = getsourcelines(object)
  File "/usr/lib/python2.7/inspect.py", line 689, in getsourcelines
    lines, lnum = findsource(object)
  File "/usr/lib/python2.7/inspect.py", line 528, in findsource
    raise IOError('source code not available')
IOError: source code not available
Makefile:114: recipe for target 'youtube_dl/extractor/lazy_extractors.py' failed
make: *** [youtube_dl/extractor/lazy_extractors.py] Error 1

If the purpose of this issue is a site support request please provide all kinds of example URLs support for which should be included (replace following example URLs by yours):

• Single video: https://www.youtube.com/watch?v=BaW_jenozKc
• Single video: https://youtu.be/BaW_jenozKc
• Playlist: https://www.youtube.com/playlist?list=PL4lCao7KL_QFVb7Iudeipvc2BCavECqzc

Note that youtube-dl does not support sites dedicated to copyright infringement. In order for site support request to be accepted all provided example URLs should not violate any copyrights.

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Description of your issue, suggested solution and other information

making lazy-extractors fails.