install.packages and dependency version checking

On Mon, Dec 15, 2008 at 12:35 PM, Prof Brian Ripley

(D) We can really only handle >= dependencies on package versions (but then
I can see no other ops in use).  install.packages() will find the latest

Ryacas works with XML 1.96-0; however, after Ryacas was released newer
versions of XML break Ryacas so a new release of Ryacas would, at the moment,
need XML (= 1.96-0).