cannot load such file — readline (LoadError) when running heroku create --stack cedar

Question

I\'m trying to deploy my Rails application to Heroku to test it out by following these instructions:

http://devcenter.heroku.com/articles/rails3#prerequisites

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Answer 1

The easiest way to install dependencies for ruby is to run:

rvm remove 1.9.3

And then

rvm install 1.9.3

Before the last command actually installs ruby, it will ask you to install dependencies. In my case I got this tip:

sudo apt-get install build-essential openssl libreadline6 libreadline6-dev curl git-core zlib1g zlib1g-dev libssl-dev libyaml-dev libsqlite3-dev sqlite3 libxml2-dev libxslt-dev autoconf libc6-dev ncurses-dev automake libtool bison subversion pkg-config

This should be run in another terminal before continuing the install.

Answer 2

Such an error usually occurs when your rvm ruby was compiled without readline extension (which happens when there weren't readline headers installed before ruby compilation). So, try the following: install libreadline-dev, then reinstall ruby:

rvm remove 1.9.3 
rvm install 1.9.3