message: Fixed elseif statement
diff: @@ -262,7 +262,7 @@ find_package(Threads REQUIRED)
  if(MSVC OR MINGW)
  SET(ADD_LINK_LIBS wsock32 ws2_32)
  -elseif(NOT APPLE AND ${CMAKE_SYSTEM_NAME} NOT STREQUAL "FreeBSD")
  +elseif(NOT APPLE AND NOT ${CMAKE_SYSTEM_NAME} STREQUAL "FreeBSD")
  if(OATPP_LINK_ATOMIC)
  SET(ADD_LINK_LIBS atomic)
  endif()
  