Link PROJ to CMAKE

[monkeybuttlipstick]

Hii, I'm a new learner to C++ and I'm struggling with linking proj lib to cmake.
I used : sudo apt-get install libproj-dev to download proj, and I tried to link to proj as https://proj.org/en/9.4/development/cmake.html suggested:
`cmake_minimum_required(VERSION 3.28)
project(transform_crs)

set(CMAKE_CXX_STANDARD 17)

find_package(PROJ REQUIRED CONFIG)

add_executable(transform_crs main.cpp)

target_link_libraries(transform_crs PRIVATE PROJ::proj)`

And it gives error:` Could not find a package configuration file provided by "PROJ" with any of
the following names:

PROJConfig.cmake
proj-config.cmake

Add the installation prefix of "PROJ" to CMAKE_PREFIX_PATH or set
"PROJ_DIR" to a directory containing one of the above files. If "PROJ"
provides a separate development package or SDK, be sure it has been
installed.`

I wonder what's the correct way to link PROJ in cmakelist then? Thank you so much for your time and help and sry this is a very basic problem. ^O^, there's not much info online about this, I'd be really appreciated you can help me with it.

[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