Mac OS X Mountain Lion “Rails is not currently installed on this system.”

Question

I am on a fresh install of OS X Mountain Lion. I have installed rails via:

sudo gem install rails

Everything seems to install correctly, but wh

Answer 1

I had the same problem.

After typing:

sudo gem install rails

and installing rails correctly, just close the Terminal window and open again. Then type:

~ $ rails -v
Rails 4.0.2

So, reseting the Terminal window fix the problem.