Sys.setenv() but got this page
instead, you are most likely running R v2.5.0 or newer. Then, see
the above link or help(Sys.setenv, package="base").
The reason for adding the same to this package is that in R v2.4.x only
Sys.putenv() is available. To make this package work on both
system, Sys.setenv() is set to Sys.putenv() on R v2.4.x
and needs to be document in order for the package to pass the tests.