[postgis-devel] GDAL and Proj versions for PostGIS 3

[Even Rouault]

Darafei,

> Proj Master/Trunk does not build with PostGIS.

I guess you need to define the ACCEPT_USE_OF_DEPRECATED_PROJ_API_H macro so as 
to be able to use proj_api.h, which will still be there in PROJ 6, but should 
be completely removed in PROJ 7. Only proj.h (the new interface since PROJ 5) 
will then be available ( https://proj4.org/development/index.html )

> There seems to have been a
> major rewrite there, and I vaguely remember rumors that it will be Proj
> 6.0. Can someone confirm? 

Yes, PROJ 6.0 should be released February/March 2019. Indeed major evolution 
of PROJ. Not a "rewrite", but significant additions. Details of the work in 
progress at https://erouault.blogspot.com/
While PostGIS may be able to use the new interfaces in a almost 1-to-1 way, to 
make use of the new late-binding capabilities (ie not relying on the pivot 
+towgs84 for datum transformations, but possibly using more direct 
transformation paths between 2 CRS when available), it will have to use the 
EPSG codes with the proj_create_crs_to_crs() API when possible rather than 
their expanded PROJ strings

> 
> GDAL:
> 
> I can't rebuild GDAL 1.11 on latest Debian.
> Per Even Rouault it is end of life already:
> https://github.com/OSGeo/gdal/issues/1153
> 
> By commit history it looks like only GDAL 2.1+ are actively maintained.

Only the last version is maintained (that is receive commits and bugfix 
releases). That is: now that GDAL 2.5dev cycle has started, there will be only 
2.4.x releases.

Even

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