Reference

All functions
libproj_cleanup()	Clean up resources used by the default context
libproj_install_proj_data() libproj_has_proj_data()	Download and install PROJ data files
libproj_version() libproj_has_libtiff() libproj_has_libcurl() libproj_default_writable_dir() libproj_default_data_dir() with_libproj_configuration() libproj_configuration() warn_for_configuration() libproj_configure()	PROJ configuration