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these are brought in through python-glue dependency
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It should be detected automatically.
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Due to this header file change:
https://sourceforge.net/p/healpix/code/818/
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Leo P. Singer authored Oct 13, 2016 and Adam Mercer committed Dec 15, 2016

We have to trick py3versions into returning an empty string by requiring
nonexistent Python versions.
Solution proposed by Steffen Grunewald.
(cherry picked from commit bc75722d28ecebb92ac27bdc010add2068c26cd6)
Original: 1d6b50216566f985852d3f7e52940c9d85409002

 * Shapely supports Python 3, whereas basemap does not.
 * Shapely raises exceptions on invalid or self-intersecting geometry,
   whereas basemap crashes Python.
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Original: 2504cd951f831f90232042a77337bd8fe984de0c

We have to trick py3versions into returning an empty string by requiring
nonexistent Python versions.
Solution proposed by Steffen Grunewald.
Original: bc75722d28ecebb92ac27bdc010add2068c26cd6

We now have Numpy >= 1.7 on all reference operating systems.
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The Debian project requries that all executables have man pages.
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This is not needed from jessie forwards.
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