Add back the R_SCRIPT environment variable.  This is useful on Ubuntu Precise, which defaults to R 2.14.  CRAN's ggplot2 no longer supports R 2.14 due to a transitive Rcpp dependency.
Add back the R_SCRIPT environment variable.  This is useful on Ubuntu
Precise, which defaults to R 2.14.  CRAN's ggplot2 no longer supports R
2.14 due to a transitive Rcpp dependency.

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