cannot install bluecloth 2.1.0 on osX 10.10.3

[Gattamelata]

hello!

i've successfully installed (on OS X 10.10.3):

- radiant (1.1.4)

- bluecloth (2.2.0)

but when i run (in a directory with a previous installation of radiant):

Gattamelata$ bundle exec script/server
Could not find bluecloth-2.1.0 in any of the sources
Run `bundle install` to install missing gems.

And I'm not able to install bluecloth-2.1.0 ... (please, see below).

Any help?

Many thanks in advance.

Gattamelata$ bundle install
The source :rubygems is deprecated because HTTP requests are insecure.
Please change your source to 'https://rubygems.org' if possible, or 'http://rubygems.org' if not.
Your Gemfile lists the gem compass-rails (~> 1.0.3) more than once.
You should probably keep only one of them.
While it's not a problem now, it could cause errors if you change the version of just one of them later.
Fetching gem metadata from http://rubygems.org/........
Fetching version metadata from http://rubygems.org/..
Using rake 10.1.0
Using RedCloth 4.2.9
Using activesupport 2.3.18
Using rack 1.1.6
Using actionpack 2.3.18
Using actionmailer 2.3.18
Using activerecord 2.3.18
Using activeresource 2.3.18
Using acts_as_list 0.1.4
Using acts_as_tree 0.1.1
Gem::Installer::ExtensionBuildError: ERROR: Failed to build gem native extension.

        /Users/maurizio/.rvm/rubies/ruby-2.2.0/bin/ruby extconf.rb

*** 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

 --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/maurizio/.rvm/rubies/ruby-2.2.0/bin/$(RUBY_BASE_NAME)

extconf.rb:7:in `<main>': uninitialized constant Config (NameError)

Gem files will remain installed in /Users/maurizio/.rvm/gems/ruby-2.2.0/gems/bluecloth-2.1.0 for inspection.

Results logged to /Users/maurizio/.rvm/gems/ruby-2.2.0/gems/bluecloth-2.1.0/ext/gem_make.out

An error occurred while installing bluecloth (2.1.0), and Bundler cannot

continue.

Make sure that `gem install bluecloth -v '2.1.0'` succeeds before bundling.

Then:...

Gattamelata$ gem install bluecloth -v '2.1.0'

Building native extensions.  This could take a while...

ERROR:  Error installing bluecloth:

 ERROR: Failed to build gem native extension.




        /Users/maurizio/.rvm/rubies/ruby-2.2.0/bin/ruby extconf.rb

*** 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

 --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/maurizio/.rvm/rubies/ruby-2.2.0/bin/$(RUBY_BASE_NAME)

extconf.rb:7:in `<main>': uninitialized constant Config (NameError)

Gem files will remain installed in /Users/maurizio/.rvm/gems/ruby-2.2.0/gems/bluecloth-2.1.0 for inspection
Results logged to /Users/maurizio/.rvm/gems/ruby-2.2.0/gems/bluecloth-2.1.0/ext/gem_make.out