Fixing svn in RStudio (Mac OS)

After updating Rstudio and R to version 3.0.3, I lost the "svn" option under version control.

Rstudio started with these messages (a clue to fixing the problem!)

During startup - Warning messages:
1: Setting LC_CTYPE failed, using "C"
2: Setting LC_COLLATE failed, using "C"
3: Setting LC_TIME failed, using "C"
4: Setting LC_MESSAGES failed, using "C"

The Internationalization of the R.app was causing this problem and a simple

system("defaults write org.R-project.R force.LANG en_US.UTF-8")

on the R command line and restarting Rstudio was all that was needed.