if (NOT APPLE)
  find_library(LIBRT_LIBRARIES rt)
  if (NOT LIBRT_LIBRARIES)
    message(FATAL_ERROR "Could not find librt")
  endif ()
else ()
  set(LIBRT_LIBRARIES "")
endif ()

find_library(LIBPTHREAD_LIBRARIES pthread)
if (NOT LIBPTHREAD_LIBRARIES)
  message(FATAL_ERROR "Could not find libpthread")
endif ()

find_library(LIBM_LIBRARIES m)
if (NOT LIBM_LIBRARIES)
  message(FATAL_ERROR "Could not find libm")
endif ()

mark_as_advanced(LIBRT_LIBRARIES LIBPTHREAD_LIBRARIES LIBM_LIBRARIES)