install rgdal and gdal in MacosX: remove previous installation

I had an error when I tried to update rgdal. It said that gdal 2.1.4 was installed whereas brew installed version 3.1
The 2.1.4 version was installed previously manually in :
/Library/Frameworks

I remove the gdal folder, installed gdal using brew and all is ok now:
brew install gdal

and in R:
install.packages("rgdal")

Note that rgdal should be replaced by terra in future

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