I'm attempting to re-install Ruby 1.9.3 with a patch that will allow me to use ruby-debug.
When following the instructions and running
rvm reinstall 1.9.3 --patch debug --force-autoconf
It runs through and after applying the patch spits out:
rvm requires autoreconf to install the selected ruby interpreter however autoreconf was not found in the PATH.
Unfortunately, googling around for how to install autoreconf on OS X v10.7 (Lion) (or much information about it at all) seems to be a dead end.