set(THREADS_PREFER_PTHREAD_FLAG ON)
find_package(Threads REQUIRED)

if(Threads_FOUND)
  #message( "lib pthread FOUND!" )
  set(pthread_LIBRARIES Threads::Threads)
  set(pthread_INCLUDE_DIRS ${Threads_INCLUDE_DIR})
else(Threads_FOUND)
  #message( "lib pthread NOT FOUND!" )
endif()