modules in RedHat

I am having problems when calling "supsmu" in R 1.6.2 installed
on RedHat 8.0. I used the rpm provided on the R site. "supsmu"
seems to have not been installed by default - (i.e., as part of
the modreg package). It also does not occur as part of any of the
contibuted packages - so there apparently is no question about 
installing it from contributed libraries. Can anyone help?

Supratik Roy