Fix compilation on CentOS. (#699)
Fix compilation on CentOS. (#699)


richardliaw/ray,stephanie-wang/ray,pcmoritz/ray-1,robertnishihara/ray,stephanie-wang/ray,robertnishihara/ray,pcmoritz/ray-1,ray-project/ray,alanamarzoev/ray,ray-project/ray,robertnishihara/ray,richardliaw/ray,alanamarzoev/ray,robertnishihara/ray,stephanie-wang/ray,alanamarzoev/ray,atumanov/ray,robertnishihara/ray,alanamarzoev/ray,robertnishihara/ray,alanamarzoev/ray,stephanie-wang/ray,pcmoritz/ray-1,ray-project/ray,robertnishihara/ray,atumanov/ray,pcmoritz/ray-1,pcmoritz/ray-1,Wapaul1/ray,robertnishihara/ray,stephanie-wang/ray,ray-project/ray,robertnishihara/ray,ujvl/ray-ng,richardliaw/ray,richardliaw/ray,alanamarzoev/ray,ray-project/ray,Wapaul1/ray,Wapaul1/ray,atumanov/ray,richardliaw/ray,Wapaul1/ray,atumanov/ray,atumanov/ray,pcmoritz/ray-1,ujvl/ray-ng,ray-project/ray,atumanov/ray,ray-project/ray,stephanie-wang/ray,atumanov/ray,stephanie-wang/ray,pcmoritz/ray-1,atumanov/ray,pcmoritz/ray-1,stephanie-wang/ray,richardliaw/ray,Wapaul1/ray,ujvl/ray-ng,ujvl/ray-ng,ray-project/ray,richardliaw/ray,Wapaul1/ray,stephanie-wang/ray,richardliaw/ray