unable to install tmap package linux mint

You are missing the gdal system library, for Unix-alikes, GDAL (>= 2.0.1), GEOS (>= 3.4.0) and Proj.4 (>= 4.8.0) are required.

Since Linux Mint is Ubuntu based, this might work

sudo apt install libudunits2-dev libgdal-dev libgeos-dev libproj-dev
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