Thanks. It seems that both Rtools210.exe and Rtools211.exe support R 1.10.x, which one is better for R 2.10.1. -- View this message in context: http://r.789695.n4.nabble.com/Package-build-and-install-under-Windows-tp2539509p2540713.html Sent from the R help mailing list archive at Nabble.com.