[R-SIG-Mac] R-GUI-6783-3.1-mavericks-Release.dmg requires X11?

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Following Simon's instructions (abstract below), I installed R-GUI-6783-3.1-mavericks-Release.dmg.

Starting R.app yields a message that it requires X11.  I neither need nor want X11.  How do I get rid of this requirement and the message?

> >> On Mar 13, 2015, at 3:10 PM, Simon Urbanek <simon.urbanek at r-project.org>
> wrote:
> >>
> >> I have more evidence that points at Xcode. If you use the R.app GUI
> that was compiled at the time of R 3.1.1 - available here:
> >>
> >> http://r.research.att.com/R-GUI-6783-3.1-mavericks-Release.dmg
> >>
> >> then all is well. As we discussed earlier, the code did not change at
> all and the underlying R version is irrelevant, so the only piece that
> changed since July last year when this was built was the Xcode version (and
> thus the compilers used). It's not clear to me at all how the Xcode version
> can affect NSTextView so badly, so this will require some more digging. In
> the meantime, please use the above R.app binary.
> >>