Installation of addreg for R under Unix.
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Proper installation of an R library under Unix requires write
permission for directories in the R source tree. Your system
administrator may need to do this. The location of the R source tree can
be found by typing 
R>  system("echo $RHOME")
inside R.

Unzip and untar the file in the directory $RHOME/src/library/
% gunzip addreg.tar.gz
% tar -xvf addreg.tar

Now make all the libraries (there is no way to make just some of them)
% make libs

Change directory to $RHOME and install all the library help
% cd ../..
% etc/install-libhelp

If you want to make HTML help you have to remake the entire R help system
% make install-html

Now when you start R you can type
R> library(addreg)
to make the functions and their help available.