CHECK_FUNCTION_EXISTS(gettimeofday HAVE_GETTIMEOFDAY)
CHECK_FUNCTION_EXISTS(nanosleep HAVE_NANOSLEEP)
CHECK_FUNCTION_EXISTS(getdtablesize HAVE_GETDTABLESIZE)
CHECK_FUNCTION_EXISTS(gettimeofday HAVE_GETTIMEOFDAY)
CHECK_FUNCTION_EXISTS(nanosleep HAVE_NANOSLEEP)
CHECK_FUNCTION_EXISTS(getdtablesize HAVE_GETDTABLESIZE)