Just tried to update devtools for R 2.15.3, and after an error about it only being available for 3.0.0, I found my previously good-enough devtools had disappeared. Here's how it happens: $ R --quiet> require(devtools)Loading required package: devtools pac> packageDescription("devtools")$Version [1] "1.1" $ R CMD INSTALL devtools_1.2.99.tar.gz * installing to library ?/nobackup/rowlings/RLibrary/R/i486-pc-linux-gnu-library/2.15? ERROR: this R is version 2.15.3, package 'devtools' requires R >= 3.0 * removing ?/nobackup/rowlings/RLibrary/R/i486-pc-linux-gnu-library/2.15/devtools? Oh well, I'll just carry on with the old... $ R --quiet> require(devtools)Loading required package: devtools Warning message: In library(package, lib.loc = lib.loc, character.only = TRUE, logical.return = TRUE, : there is no package called ?devtools? Oh gee thanks. 1.2.99 wouldn't install, so you zapped my otherwise perfectly good 1.1? Feature? Bug? Fixed in 3.0.0 (can't see it in NEWS)? Barry