$ rm -rf build install; colcon build
Starting >>> fail_example
--- stderr: fail_example
CMake Error at /usr/share/cmake-3.10/Modules/FindPackageHandleStandardArgs.cmake:137 (message):
  Could NOT find FastRTPS (missing: FastRTPS_INCLUDE_DIR FastRTPS_LIBRARIES)
Call Stack (most recent call first):
  /usr/share/cmake-3.10/Modules/FindPackageHandleStandardArgs.cmake:378 (_FPHSA_FAILURE_MESSAGE)
  /opt/ros/bouncy/share/fastrtps_cmake_module/cmake/Modules/FindFastRTPS.cmake:95 (find_package_handle_standard_args)
  /opt/ros/bouncy/share/rmw_fastrtps_cpp/cmake/rmw_fastrtps_cpp-extras.cmake:20 (find_package)
  /opt/ros/bouncy/share/rmw_fastrtps_cpp/cmake/rmw_fastrtps_cppConfig.cmake:30 (include)
  /opt/ros/bouncy/share/rmw_implementation_cmake/cmake/call_for_each_rmw_implementation.cmake:61 (find_package)
  /opt/ros/bouncy/share/rosidl_generator_py/cmake/rosidl_generator_py_get_typesupports.cmake:26 (call_for_each_rmw_implementation)
  /opt/ros/bouncy/share/rosidl_generator_py/cmake/rosidl_generator_py_generate_interfaces.cmake:27 (rosidl_generator_py_get_typesupports)
  /opt/ros/bouncy/share/ament_cmake_core/cmake/core/ament_execute_extensions.cmake:38 (include)
  /opt/ros/bouncy/share/rosidl_cmake/cmake/rosidl_generate_interfaces.cmake:169 (ament_execute_extensions)
  CMakeLists.txt:28 (rosidl_generate_interfaces)