R_LIBS_USER bugs

Hi,

Having currently a big problem with R 2.10.1 vanilla (Solaris):

As soon as the R_LIBS_USER env var gets bigger than 1023 chars R
completely ignores it and uses the default:

I guess the first question is, why do need such a long list of library
directories?

Sys.getenv('R_LIBS_USER');

                                          R_LIBS_USER 
"${R_LIBS_USER-~/R/i386-pc-solaris2.11-library/2.10}" 

I see the same thing with R-devel on OS X.  I can set R_LIBS_USER from
within R using Sys.setenv to a value longer than 1024 and retrieve it
again.  But if I have such a value in my shell, it gets overwritten.

I'm not yet sure what is going on.

+ seth