R.app warning on Mac

If install R.app on a Mac without default locale setting to UTF-8, warning message comes up while starting up R.app. The warning message is as follows:

To solve this issue, close R.app and type following command in terminal.
$> defaults write org.R-project.R force.LANG en_US.UTF-8
Relaunch R.app and the warning disappears.

[1] http://cran.r-project.org/bin/macosx/RMacOSX-FAQ.html#Internationalization-of-the-R_002eapp
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