R-beta: unix failure in windows R ?

[Troels Ring]

I installed the RApril with all the warnings of a pre-beta version, but
had it quickly produce some beautiful graphs etc. Then, since I'm
interested in regression, I downloaded the S-plus package for Aalen's
additive regression model, and I got a fixed version for Windows/R
already by the next day, but when I tried
library(addreg) I got the error below.
Error in system(call, intern) : "system" is only available on Unix>
Well, all beginning is difficult, but what now ?
R really looks funny, thanks a lot
Troels

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