> gnm_wrap.cpp is missing in GDAL-2.1.3.tar.gz on
> This caused the following error when building osgeo._gnm extension:
In GDAL 2.1, GNM was disabled by default, so the generated bindings don't include gnm_wrap.cpp
Either rebuild your GDAL --without-gnm, or regenerate the Python bindings so gnm_wrap.cpp is generated.
Spatialys - Geospatial professional services