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In the configuration script:
https://hg.python.org/cpython/file/47b2d1ff9743/configure.ac#l963
There is a special treatment done for FreeBSD, which is not needed, FreeBSD is perfectly fine with multiple digit in soversion.

> https://hg.python.org/cpython/file/47b2d1ff9743/configure.ac#l963
This command was added by the changeset 6fc10306bf31.

Adding a patch on configure.ac (I bet configure should not be patched but regenerated)
Considering the comment here: http://bugs.python.org/issue1044395#msg47064 about ldconfig(1) the output of ldconfig(1) is buggy in that regard, and the ports tree does not depends on that anymore so it will perfectly accept the 2 digit name.
There are no known other things depending on that buggy output

+1

> koobs	set	versions: + Python 2.7, Python 3.4, Python 3.5
Do you seriously consider to modify Python 2.7 and 3.4? Can it break the backward compatibility?
I don't know how the SOVERSION thing is used.

Provide more information:
Here is a description of the problem with the FreeBSD ldconfig(1) problem and why it was a problem with libpython.so.*
https://wiki.freebsd.org/ports/fix_lib_depends
Here is the commit that adds the new methode for ports to lookup for libraries installed (not using ldconfig(1):
https://svnweb.freebsd.org/ports?view=revision&revision=322328
here is the commit that removes the ancient method:
https://svnweb.freebsd.org/ports?view=revision&revision=362031 

I do not think it is worth changing python 2.7 or python 3.4 given the fact that the .so.1 symlink is not created (which imho it should be a good idea to create but let's go step by step)
Let's just do it for next python

@haypo, yes, absolutely and no
We will backport to security-only branches ourselves.

Oh, I expected such change to break backward compatibility. If it doesn't,
it's fine.
Koobs, would you like to commit the patch?

@haypo, if you could take care of the change in default, 3.4 and 2.7, we can backport the rest downstream. Thank you :)
@bapt, can you create a separate issue to cover the "create foo.so.X' symlink" request, so python@ (freebsd team) can work to patch locally with an upstream reference

New changeset 7444ac6d93c3 by Victor Stinner in branch 'default':
Issue #23817: FreeBSD now uses "1.0" the the SOVERSION as other operating
https://hg.python.org/cpython/rev/7444ac6d93c3 

> Let's just do it for next python
Ok.
I don't understand the purpose of SOVERSION, nor why it is an issue to not use dots on FreeBSD. So I don't want to change it in minor Python relases (2.7.x, 3.4.y).

New changeset 0b3027a2abbc by Ned Deily in branch 'default':
Issue #23817: run autoreconf to update configure.
https://hg.python.org/cpython/rev/0b3027a2abbc 

> Issue #23817: run autoreconf to update configure.
Oh thanks, I forgot to regenerate configure!