[R] "Warning message: package '...' was built under R version 2.3.0"

[Duncan Murdoch]

Tuszynski, Jaroslaw W. wrote:
> Hi,
> 
> While installing precompiled packages I often get warnings like the one in
> the subject. I usually ignore them, but I still do not understand why
> windows packages are build with unreleased versions of R. 
> Is there some way to get packages build under R-2.2.0?

I think this part of your question was determined to be a problem with a 
certain mirror (but I didn't read all the messages on this...)

> What are potential problems that can result from that version mismatch?

Newer versions of R may store things differently.  We try hard to make 
sure that newer versions can read data from older ones, but it's hard to 
work in the opposite direction.

For one important change, an environment of NULL in 2.2.x has been 
replaced with an environment of baseenv() in 2.3.x.  2.3.x can usually 
translate the NULLs, but 2.2.x won't know what a baseenv() object is.

Duncan Murdoch