[Bug 237795] devel/gobject-introspection: "needs Python 3.4 at least, but 2.7 was specified."

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=237795

--- Comment #6 from Mikhail Teterin <mi at FreeBSD.org> ---
Gentlemen, what's happening? The problem's been analyzed... When building a
port (P0), that -- for whatever reason -- wants Python-N, the Python-version is
propagated to all dependencies.

When one of the dependencies (Pk) is incompatible with Python-N, you get the 
error...

In Marco's case, for example, P0 is math/gnumeric, which insists on Python-2.7
-- and Pk is devel/gobject-introspection, which wants 3.4+ or higher.

This is difficult to reproduce, because, once you have the dependency (such as
gir) installed -- either through a direct "make install" or via a pre-built
package -- the dependents will build just fine... The problem strikes only,
when the dependency is built automatically -- with the requested Python-version
passed from the dependent.

The bug is not with devel/gobject-introspection itself. This is a portmgr (or
python@ ?) issue -- there needs to be a way to distinguish between the two
cases:

 1. I'm going to use Python-N, and so must you, or else we'd be incompatible at
run-time.
 2. I need to use Python-N, but I don't care, what you're using.

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