Fix build on TravisCI
Fix build on TravisCI

jhliberty/sisyphus,GerHobbelt/sisyphus,deenjohn/sisyphus,HuijiWiki/sisyphus,deenjohn/sisyphus,HuijiWiki/sisyphus,GerHobbelt/sisyphus,simsalabim/sisyphus,jhliberty/sisyphus,EagerApps/sisyphus,simsalabim/sisyphus