Link PROJ to CMAKE about proj

[rouault]

which Linux distribution and PROJ version do you use ? PROJ Cmake config files are only available in recent enough PROJ version

[monkeybuttlipstick]

@rouault Hiii, the info as follows:
Distributor ID: Ubuntu Description: Ubuntu 22.04.3 LTS Release: 22.04
PROJ: (8.2.1-1).

[rouault]

ok, the issue is that Ubuntu 22.04 has built PROJ using autotools and not CMake, so the CMake config files aren't available in that distribution. You will need to use a FindPROJ.cmake module in your project, like https://github.com/OSGeo/gdal/blob/master/cmake/modules/packages/FindPROJ.cmake