no such file to load — readline (LoadError) – Rails 3.0.3 console – rvm


When you try to run the console rails c in a new Rails 3.0.3 application, and when you use rvm, you get the following error:

no such file to load -- readline (LoadError)


It’s quite like likely that the readline libraries are missing from your installation. To find out which ones go to the directory that the error is indicating (ie):

cd ~/.rvm/rubies/ruby-1.8.7-p299

and then to the following:

cd ext/readline

then run the following:

ruby extconf.rb

If you get something like:
checking for readline/readline.h... no
checking for editline/readline.h... no

then you are probably missing the neccessary header files for readline.
so install them in your system (ie in Mandriva):

sudo urpmi readline-dev,

In Debian you will need to install libreadline5-dev and maybe libncurses5-dev (apt-get install).

When the package is installed successfully run the following again:

ruby extconf.rb
sudo make install

You should now be able to go back to your project and run rails c with no errors.