Andreas, > Can QGIS 2.18 be built against GDAL 3.x?
Hum, I guess it would build, although definitely not a vetted combination. I wouldn't expect datum transformations to work very well, since QGIS would be dependent on towgs84 coming in PROJ.4 strings, and GDAL 3 / PROJ >= 6 will not populate that often now. You might have to add -DACCEPT_USE_OF_DEPRECATED_PROJ_API_H in CMAKE_CXX_FLAGS to get QGIS to build against PROJ >= 6 You should check also which PROJ version your spatialite lib is linking to. You might instead to choose the 'internal PROJ' trick (https://trac.osgeo.org/gdal/wiki/ BuildingOnUnixGDAL25dev) to have only GDAL built against PROJ >= 6 and have the rest of the stack (spatialite, QGIS) still using PROJ 5 Even -- Spatialys - Geospatial professional services http://www.spatialys.com
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