mapbox / mapbox/osm-bright

initialize proj_transform for given projections without proj4 support (-DMAPNIK_USE_PROJ4)

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CartoCSS
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Description

change openstreetmap style to osm-bright, got errors when render:
```
** (process:137): ERROR **: 13:19:09.269: failed to render TILE default 0 0-0 0-0

** (process:137): ERROR **: 13:19:09.269: reason: Cannot initialize proj_transform for given projections without proj4 support (-DMAPNIK_USE_PROJ4): '+proj=merc +a=6378137 +b=6378137 +lat_ts=0.0 +lon_0=0.0 +x_0=0.0 +y_0=0 +k=1.0 +units=m +nadgrids=@null +wktext +no_defs +over'->'+proj=merc +a=6378137 +b=6378137 +lat_ts=0.0 +lon_0=0.0 +x_0=0.0 +y_0=0.0 +k=1.0 +units=m +nadgrids=@null +wktext +no_defs +over'
```

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  3. Fork the repository and make your change on a branch.
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Research direction

Start by reproducing the tile-rendering failure after changing the OpenStreetMap style to osm-bright, then inspect the projection transformation path and the build configuration for -DMAPNIK_USE_PROJ4. Done means the reported projections initialize and the default tile renders without the proj4-support error.

Written by the indexing model from the issue text.

Assessment

Domain
computer-graphics
Issue type
Bug
Difficulty
4/5
Estimated time
3-5 days
Activity status
Stale
Clarity
Needs clarification
Newbie friendliness
25/100

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