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