[OSGeoLive] #2352: mapnik python demo ol15

[OSGeoLive]

#2352: mapnik python demo ol15
-----------------------------+----------------------------
 Reporter:  darkblueb        |       Owner:  osgeolive@…
     Type:  defect           |      Status:  new
 Priority:  critical         |   Milestone:  OSGeoLive15.0
Component:  OSGeoLive        |  Resolution:
 Keywords:  mapnik, jupyter  |
-----------------------------+----------------------------
Comment (by sanak):

 The error message itself seems to come from mapnik core library.
 https://github.com/mapnik/mapnik/blob/v3.1.x/src/proj_transform.cpp#L129-L134
 {{{
 #ifdef MAPNIK_USE_PROJ4
             source_.init_proj4();
             dest_.init_proj4();
 #else
             throw std::runtime_error(std::string("Cannot initialize
 proj_transform for given projections without proj4 support
 (-DMAPNIK_USE_PROJ4): '") + source_.params() + "'->'" + dest_.params() +
 "'");
 #endif
 }}}

 I compared libmapnik between OSGeoLive 14.0 and 15.0beta1 environments,
 and I noticed that OSGeoLive 15.0beta1 libmapnik3.1 seems not to link to
 libproj.

 - OSGeoLive 14.0
 {{{
 $ dpkg -l | grep libmapnik
 ii  libmapnik3.0 ...
 :
 $ dpkg -L libmapnik3.0
 :
 /usr/lib/libmapnik.so.3.0
 $ ldd /usr/lib/libmapnik.so.3.0 | grep libproj
         libproj.so.19 ...
 }}}

 - OSGeoLive 15.0beta1
 {{{
 $ dpkg -l | grep libmapnik
 ii  libmapnik3.1 ...
 :
 $ dpkg -L libmapnik3.1
 :
 /usr/lib/libmapnik.so.3.1
 $ ldd /usr/lib/libmapnik.so.3.1 | grep libproj
 }}}

 So, I guess that rebuilding {{{libmapnik3.1}}} with
 {{{-DMAPNIK_USE_PROJ4}}} flag or downgrading to {{{libmapnik3.0}}} may
 solve this issue.
-- 
Ticket URL: <https://trac.osgeo.org/osgeolive/ticket/2352#comment:8>
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