We run R in a multiuser environment (Mac OSx Leopard Server utilizing R +ESS over an ssh connection) that requires us to keep multiple versions of R (R-2.7.2 and higher) available on the same machine. I have successfully installed multiple R versions using the binaries for Mac OSX and deleting the relevant Receipt before installing the newer version of R. My problem occurs when allowing individuals to run different versions of R. I would like to be able to allow users to run any verison that is currently installed. The Rswitch gui works nicely if I want to make a global switch (for all individuals) from one version of R to another. The Mac OSx FAQ recommends not to hardcode the shell scripts to start R to a specific version (FAQ 12.15). Am I better off building R from source for each version we need and bypassing the Frameworks approach for R used by the binaries or is the a "safe" approach to use the binaries and utilize hardcoded shell scripts to point to a given version of R? (I have created some shell scripts (hacked from those provided) that allows me to start either R-2.6.1 or R-2.7.2 but the Mac OSX R FAQ recommends against this approach.) If there is somewhere else I should be reading, I would appreciate a pointer and I would be happy to review.

Thanks for any help.

Bill

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