if(LSB_RELEASE)
  return()
endif()

find_program(_lsb_release_executable lsb_release)

if(_lsb_release_executable)
  execute_process(COMMAND ${_lsb_release_executable} -sc
    OUTPUT_VARIABLE LSB_CODENAME OUTPUT_STRIP_TRAILING_WHITESPACE)

  execute_process(COMMAND ${_lsb_release_executable} -sr
    OUTPUT_VARIABLE LSB_RELEASE OUTPUT_STRIP_TRAILING_WHITESPACE)

  execute_process(COMMAND ${_lsb_release_executable} -si
    OUTPUT_VARIABLE LSB_DISTRIBUTOR_ID OUTPUT_STRIP_TRAILING_WHITESPACE)
else()
  set(LSB_DISTRIBUTOR_ID "unknown")
  set(LSB_RELEASE "unknown")
  set(LSB_CODENAME "unknown")
endif()