Using PROJ in CMake projects

The recommended way to use the PROJ library in a CMake project is to link to the imported library target ${PROJ_LIBRARIES} provided by the CMake configuration which comes with the library. Typical usage is:


target_link_libraries(MyApp PRIVATE ${PROJ_LIBRARIES})

By adding the imported library target ${PROJ_LIBRARIES} to the target link libraries, CMake will also pass the include directories to the compiler. This requires that you use CMake version 2.8.11 or later. If you are using an older version of CMake, then add


The CMake command find_package will look for the configuration in a number of places. The lookup can be adjusted for all packages by setting the cache variable or environment variable CMAKE_PREFIX_PATH. In particular, CMake will consult (and set) the cache variable PROJ_DIR.

The old CMake name for the PROJ project was “PROJ4” and the switch to the name “PROJ” was made with version 7.0. So if you expect your package to work with pre-7.0 versions of PROJ, you will need to use

target_link_libraries(MyApp PRIVATE ${PROJ4_LIBRARIES})

This will also find version 7.0. This use of the PROJ4 name will be phased out at some point.