message: add default install prefix
diff: @@ -71,8 +71,15 @@ endif()
  set(generated_dir "${CMAKE_CURRENT_BINARY_DIR}/generated")
  +if(CMAKE_SYSTEM_NAME STREQUAL Linux)
  + include(GNUInstallDirs)
  + set(include_install_dir ${CMAKE_INSTALL_INCLUDEDIR})
  + set(config_install_dir "${CMAKE_INSTALL_LIBDIR}/cmake/${PROJECT_NAME}")
  +else()
  set(include_install_dir "include")
  set(config_install_dir "lib/cmake/${PROJECT_NAME}")
  +endif()
  +
  set(version_config "${generated_dir}/${PROJECT_NAME}ConfigVersion.cmake")
  set(project_config "${generated_dir}/${PROJECT_NAME}Config.cmake")
  