Did you install binary from CRAN with the same result? Your OSX version is
newer than that used on the CRAN testing framework - are other packages
also failing? Have you checked that other packages are up to date?
Probably the maintainer does not use OSX (nor do I), so it is hard to say
what is specific about your system that is causing the problem. If you are
trying to install from source, your Rcpp package may need refreshing, but
it is very hard to tell. Do report back when resolved.