Building a Mapnik 3 backport for Debian stable

[Sven Geggus]

Bas Couwenberg <sebastic at xs4all.nl> wrote:

> Correct, python-mapnik has been split off into its own project, and got 
> its own source package because of that.

Hm, python-mapnik gives me strange messages. This is not my backport only
but also your version which I ran in a stretch chroot:

# python 
Python 2.7.11+ (default, May  9 2016, 15:54:33) 
[GCC 5.3.1 20160429] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import mapnik
/usr/lib/python2.7/dist-packages/mapnik/__init__.py:74: RuntimeWarning: to-Python converter for std::shared_ptr<mapnik::geometry::geometry<double>> already registered; second conversion method ignored.
  from ._mapnik import *
/usr/lib/python2.7/dist-packages/mapnik/__init__.py:74: RuntimeWarning: to-Python converter for std::shared_ptr<mapnik::feature_impl> already registered; second conversion method ignored.
  from ._mapnik import *
/usr/lib/python2.7/dist-packages/mapnik/__init__.py:74: RuntimeWarning: to-Python converter for std::shared_ptr<mapnik::Featureset> already registered; second conversion method ignored.
  from ._mapnik import *
/usr/lib/python2.7/dist-packages/mapnik/__init__.py:74: RuntimeWarning: to-Python converter for std::shared_ptr<mapnik::datasource> already registered; second conversion method ignored.
  from ._mapnik import *
/usr/lib/python2.7/dist-packages/mapnik/__init__.py:74: RuntimeWarning: to-Python converter for std::shared_ptr<mapnik::image_any> already registered; second conversion method ignored.
  from ._mapnik import *

Is this harmless? 

Looks like this has already been reported upstream:
https://github.com/mapnik/python-mapnik/issues/94


Sven

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