Fixed a compile issue on OSX.
Fixed a compile issue on OSX.

asamerh4/mesos,craimbert/mesos,andschwa/mesos,dforsyth/mesos,Aman-Jain-14/customizedMesos,andschwa/mesos,reneploetz/mesos,yuquanshan/customizedMesos,dforsyth/mesos,neilconway/mesos,jpeach/mesos,neilconway/mesos,Gilbert88/mesos,chhsia0/mesos,andschwa/mesos,andschwa/mesos,zmalik/mesos,dforsyth/mesos,verizonlabs/mesos,andschwa/mesos,kaysoky/mesos,verizonlabs/mesos,craimbert/mesos,zmalik/mesos,kaysoky/mesos,kaysoky/mesos,chhsia0/mesos,asamerh4/mesos,verizonlabs/mesos,zmalik/mesos,kaysoky/mesos,Aman-Jain-14/customizedMesos,kaysoky/mesos,Gilbert88/mesos,jpeach/mesos,gsantovena/mesos,Aman-Jain-14/customizedMesos,reneploetz/mesos,abudnik/mesos,verizonlabs/mesos,neilconway/mesos,chhsia0/mesos,asamerh4/mesos,chhsia0/mesos,kaysoky/mesos,verizonlabs/mesos,Gilbert88/mesos,zmalik/mesos,gsantovena/mesos,asamerh4/mesos,dforsyth/mesos,zmalik/mesos,craimbert/mesos,yuquanshan/customizedMesos,zmalik/mesos,gsantovena/mesos,Aman-Jain-14/customizedMesos,chhsia0/mesos,chhsia0/mesos,neilconway/mesos,Aman-Jain-14/customizedMesos,neilconway/mesos,neilconway/mesos,gsantovena/mesos,reneploetz/mesos,yuquanshan/customizedMesos,yuquanshan/customizedMesos,abudnik/mesos,gsantovena/mesos,reneploetz/mesos,craimbert/mesos,kaysoky/mesos,dforsyth/mesos,zmalik/mesos,craimbert/mesos,asamerh4/mesos,Gilbert88/mesos,reneploetz/mesos,abudnik/mesos,dforsyth/mesos,reneploetz/mesos,reneploetz/mesos,Gilbert88/mesos,Gilbert88/mesos,verizonlabs/mesos,yuquanshan/customizedMesos,andschwa/mesos,jpeach/mesos,gsantovena/mesos,craimbert/mesos,asamerh4/mesos,jpeach/mesos,abudnik/mesos,chhsia0/mesos,verizonlabs/mesos,abudnik/mesos,yuquanshan/customizedMesos,Aman-Jain-14/customizedMesos,Aman-Jain-14/customizedMesos,jpeach/mesos,asamerh4/mesos,andschwa/mesos,abudnik/mesos,jpeach/mesos,gsantovena/mesos,neilconway/mesos,Gilbert88/mesos,yuquanshan/customizedMesos,dforsyth/mesos,abudnik/mesos,jpeach/mesos,craimbert/mesos