try using a different OS X version on Travis to see if that fixes the build
try using a different OS X version on Travis to see if that fixes the build

mozilla/sccache,luser/sccache2,luser/sccache2,glandium/sccache,glandium/sccache,mozilla/sccache,luser/sccache2,mozilla/sccache,glandium/sccache,luser/sccache2,glandium/sccache