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Trouble installing rgdal

The revisions needed to install on PROJ 6.1.0 and GDAL 3.0.0 involved a 
compiled function that only entered PROJ in 6.2.0, another that only 
entered GDAL in 3.0.1, and bugs in handling +proj=ob_tran in PROJ 6.0.0, 
6.1.0 and 6.1.1. Revision 1031 covering these and letting rgdal install on 
these (oldish) versions has been committed to R-Forge, and when the build 
completes will answer the intial question. The package installed using the 
old PROJ API because that choice also avoided the problem with GDAL, but 
didn't advance to being able to use WKT2 instead of Proj4 strings 
internally (with sp >= 1.4). In any case, GDAL 3.0.4 and PROJ 6.3.1 or 
later is a safer choice, but at least now those obliged to stay with 
earlier GDAL 3 and PROJ 6 should be covered.

Roger
On Sat, 4 Jul 2020, Thomas Adams wrote: