I would like to install two versions of R on Mac OSX 10.6.7.

The two versions I would like to install are 2.10.1 and 12.2.2 for use with StatET in Eclipse.  I have successfully installed and used each version respectively with StatET in Eclipse.  However, I have not been successful in getting both of them configured for use on the same system.

We know from the Read Me during the .pkg installation that R will over write older versions.  The installer recommends running:

	pkgutil --forget org.r-project.R.Leopard.fw.pkg

to keep the previous versions.  In addition, a reply (Mon Feb 9 15:31:19 CET 2009) to a similar question in this form recommends using 

	pkuntils --pkgs | grep r-project

I "believe" that both of these commands run successfully.  However, the next installation of R still over-writes the previous version.

The (Mon Feb 9 15:31:19 CET 2009)  post also states to delete: 
	
	./Library/Receipts/R-Frameworks.pkg 

However, neither 2.10.1 or 12.2.2 create a R-Frameworks.pkg in ./Library/Receipts/.

I would be genuinely  interested in obtaining detailed and organized instructions on how to successfully install two versions of R on the same system.

It would also be great if those instructions were written in such a way that a user with limited Linux experience could understand and implement them.

Best,
Justin
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