sstephenson/ruby-build — pull request #518 by dpoggi (2014-02-26 09:30:12+00:00)
Title: Fix #517

Better to use -f than -e to check for a user-specified definition file.
With -e, if the user accidentally types the name of a directory (or, far
less likely, a device file) with the same name as the Ruby they're
trying to install, they end up with ruby-build doing absolutely nothing
at best, or an error message that could be pretty confusing at worst.