Compile warning on OS X

[Igor]

include/common/time.h:111:29: warning: implicit conversion from
'unsigned long' to '__darwin_suseconds_t' (aka 'int') changes value
from
      18446744073709551615 to -1 [-Wconstant-conversion]
        tv->tv_sec = tv->tv_usec = TV_ETERNITY;
                                 ~ ^~~~~~~~~~~
include/common/time.h:32:26: note: expanded from macro 'TV_ETERNITY'

Can I ignore this warning even the compile succeed? Thanks for any suggestion.

Bests,
-Igor