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s/PROJ_INCLUDE_DIR/PROJ_INCLUDE_DIRS
Recent versions of PROJ (like the 9.2.0 I'm currently using) isn't exposing PROJ_INCLUDE_DIR
but PROJ_INCLUDE_DIRS
in the CMake configuration exported.
I'm not sure how multiple versions of PROJ should be handled if retro-compatibility with PROJ 6 is still desired and supported.