Installing bluecloth - configuration options?

I tried installing the bluecloth gem by typing

gem install bluecloth

But when I do that I get the following error message:

checking for random()... *** extconf.rb failed ***
Could not create Makefile due to some reason, probably lack of
necessary libraries and/or headers.  Check the mkmf.log file for more
details.  You may need configuration options.

Provided configuration options:
    --with-opt-dir
    --without-opt-dir
    --with-opt-include
    --without-opt-include=${opt-dir}/include
    --with-opt-lib
    --without-opt-lib=${opt-dir}/lib
    --with-make-prog
    --without-make-prog
    --srcdir=.
    --curdir
    --ruby=/Users/cyrusstoller/.rvm/rubies/ruby-1.9.2-p136/bin/ruby
    --with-rdiscount-dir
    --without-rdiscount-dir
    --with-rdiscount-include
    --without开发者_StackOverflow中文版-rdiscount-include=${rdiscount-dir}/include
    --with-rdiscount-lib
    --without-rdiscount-lib=${rdiscount-dir}/lib

What options am I supposed to provide?

I needed to have markdown installed before I tried to install the gem.

run

brew install markdown

then

gem install bluecloth

I had the same problem when trying to install bluecloth 2.0.11 under Ruby 2.2.3. Turns out that Ruby 2.2.3 was too new. Going back to Ruby 2.1.5 resolved the issue.

Check your .ruby-version.