if(PROJECT_ENABLE_LIBEVENT)
  if(PROJECT_BUILD)
    find_package(Libevent ${LIBEVENT_VERSION} REQUIRED)

    add_definitions(-DPROJECT_ENABLE_LIBEVENT)

    include_directories(BEFORE SYSTEM
      ${LIBEVENT_INCLUDE_DIRS}
    )

    link_libraries(
      ${LIBEVENT_LIBRARIES}
    )
  elseif(NOT PROJECT_IS_MINGW OR CMAKE_HOST_WIN32)
    if(PROJECT_BUILD_SHARED_LIBS)
      set(LIBEVENT_LIBRARY_TYPE BOTH)
    else()
      set(LIBEVENT_LIBRARY_TYPE STATIC)
    endif()

    ExternalProject_Add(libevent_project
      PREFIX external
      URL ${PROJECT_3RD_PARTY_DIR}/libevent-${LIBEVENT_VERSION}-stable.tar.gz
      URL_HASH SHA256=92e6de1be9ec176428fd2367677e61ceffc2ee1cb119035037a27d346b0403bb
      LIST_SEPARATOR |
      CMAKE_ARGS ${PROJECT_EXTERNAL_CMAKE_FLAGS}
        -DBUILD_SHARED_LIBS=${PROJECT_BUILD_SHARED_LIBS}
        -DBUILD_STATIC_LIBS=ON
        -DEVENT__DISABLE_OPENSSL=ON
        -DEVENT__DISABLE_SAMPLES=ON
        -DEVENT__DISABLE_TESTS=ON
        -DEVENT__LIBRARY_TYPE=${LIBEVENT_LIBRARY_TYPE}
    )

    set(PROJECT_DEPENDENCIES 
      ${PROJECT_DEPENDENCIES}
      libevent_project
    )
  endif()
endif()