Travis build error fix.
Travis build error fix.
kernelim/zmqpp,zeromq/zmqpp,kernelim/zmqpp,datasift/zmqpp,zeromq/zmqpp,chenwenbin928/zmqpp,sunkin351/zmqpp,datasift/zmqpp,xaqq/zmqpp,pin3da/zmqpp,pin3da/zmqpp,benjamg/zmqpp,xaqq/zmqpp,sunkin351/zmqpp,benjamg/zmqpp,chenwenbin928/zmqpp