This probably means you do not have Rtools installed, see here : http://www.murdoch-sutherland.com/Rtools/installer.html greetings, Remko -- View this message in context: http://r.789695.n4.nabble.com/can-not-built-a-package-tp3023089p3023170.html Sent from the R devel mailing list archive at Nabble.com.