[docs] [issue18384] Add devhelp build instructions to the documentation makefile

[Balthazar Rouberol]

Changes by Balthazar Rouberol <brouberol at imap.cc>:


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title: Add devhelp build instructions to the documentation makefile (Python3) -> Add devhelp build instructions to the documentation makefile
versions: +Python 2.7
Added file: http://bugs.python.org/file30826/devhelp-build-py2.patch

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<http://bugs.python.org/issue18384>
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