[QGIS-Developer] QGIS build error in Ubuntu 18.04

[Samweli]

Hi Stephen, 

Thanks a lot for your help, I have downgraded to PROJ 6.3.1 by installing it
from source. Now I get this error

[ 39%] Built target pyqtcompat
make[2]: *** No rule to make target
'/usr/lib/x86_64-linux-gnu/libspatialite.so', needed by
'output/lib/libqgis_core.so.3.13.0'.  Stop.
CMakeFiles/Makefile2:1320: recipe for target
'src/core/CMakeFiles/qgis_core.dir/all' failed
make[1]: *** [src/core/CMakeFiles/qgis_core.dir/all] Error 2
Makefile:162: recipe for target 'all' failed
make: *** [all] Error 2

When I try to install libspatialite, it also installs PROJ 7, causing to
revert to the previous "invalid pointer" error!!





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