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
I solved my autoreconf problem adding the path to my shell:
sudo pico /etc/paths
then I added the line
/sw/bin
where I found the autoreconf and autoconf files and saved everything.
autoreconf
Since then I can use autoreconf without any problems.