rbenv build failed on Ubuntu 14.04
UPDATE: Use Ruby 2.1.2, it fixes this issue.
14.04 is probably shipping with readline 6.3, which uses rl_hook_func_t instead of Function.
This bug has already been reported and fixed in Ruby (https://bugs.ruby-lang.org/issues/9578), but not released yet.
Until Ruby 2.1.2 comes out (which I assume will contain this fix), you can use a patch to properly support the new rl_hook_func_t method. Use this to install Ruby 2.1.1:
curl -fsSL https://gist.github.com/mislav/a18b9d7f0dc5b9efc162.txt | rbenv install --patch 2.1.1
(Source: http://gorails.com/setup/ubuntu/14.04)
rbenv ruby install fail ubuntu
install these dependencies first and then retry worked for me on 14.04 for ruby 2.2.0 with rbenv
sudo apt-get install autoconf bison build-essential libssl-dev libyaml-dev libreadline6-dev zlib1g-dev libncurses5-dev libffi-dev libgdbm3 libgdbm-dev
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