[Bug 241463] [NEW PORT] devel/scons-py3: scons for python3

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=241463

--- Comment #9 from Kubilay Kocak <koobs at FreeBSD.org> ---
(In reply to Sunpoet Po-Chuan Hsieh from comment #6)

This is the better option. The scons port should do nothing but declare the
versions *it* supports, and scons consumers ought to declare specifically the
version(s) they support, allowing them to move forward at their own pace,
without 'imperative' selection by the framework.

Notes:

- It's worth considering having scons.mk support <version-specifier> in the
exact same way that USES=python supports it, rather than it being an FLAVOR
argument (scons:py27)

This allows, scons consuming ports to declaratively specify/declare version
support, rather than 'imperatively' 'choosing' a framework specific
implementation details (flavor)

This also enables / gives us the ability to factor out a generic
<version-specifier> support across more areas of the framework, starting with
Python / Scons, and improving it in the process ("!=X" support, "X,Y" support,
etc), which has huge benefits for consistency and version derivation across our
tree.

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