[issue21215] build-deps instructions for Ubuntu

[Barry A. Warsaw]

Barry A. Warsaw added the comment:

The `python3` binary package is a sort of meta package that brings in the interpreter (and some ancillary stuff) for all supported Python 3 versions.  For Ubuntu 14.04 that will be just python3.4.  But if you want to build the interpreter from source (e.g. an hg clone) on an Ubuntu system, you'll need to bring in the Build-Depends for the specific interpreter package you want.  That would be python3.4 or python3.3, etc.  It's generally okay to `sudo apt-get build-dep python3.3` on a-pre-14.04 Ubuntu to get all the build-deps for Python 3.4.  There maybe something you'll need to install manually, but I can't think of what that is.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue21215>
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