Need help to building R package with devtools
Can someone help what I need to do to make 'devtools' work?
A quick asking around indicates that Rtools 3.0 should work fine for 2.15.3 maintenance. Thus, the issue is probably a purely formal bug in devtools's version comparison logic, and you need to pester its maintainer. Unless it has been fixed already, in which case you need to update devtools.
I'm pretty sure it has been fixed already, otherwise please file a bug (with a copy of your sessionInfo()) at https://github.com/hadley/devtools/issues -- RStudio / Rice University http://had.co.nz/