[Coquelicot] Installation

[Garreau Alexandre]

Hi, I've some problems with coquelicot installation on my Debian
GNU/Linux Wheezy server:

        root at server-713:/var/www# git clone
        https://coquelicot.potager.org/coquelicot.git
        Cloning into 'coquelicot'...
        root at server-713:/var/www# cd coquelicot
        root at server-713:/var/www/coquelicot# git tag -v coquelicot-0.9.2
        object 069a8c16bb82b9daebd9918b34c582a9b3d346af
        type commit
        tag coquelicot-0.9.2
        tagger Lunar <lunar at anargeek.net> 1365437455 +0200
        
        coquelicot 0.9.2
        gpg: Signature made Mon Apr  8 18:10:55 2013 CEST using RSA key
        ID A8D1112A
        gpg: Can't check signature: public key not found
        error: could not verify the tag 'coquelicot-0.9.2'
        root at server-713:/var/www/coquelicot# git checkout -b production
        coquelicot-0.9.2
        Switched to a new branch 'production'
        root at server-713:/var/www/coquelicot# less INSTALL 
        root at server-713:/var/www/coquelicot# apt-get install rubygems
        Reading package lists... Done
        Building dependency tree       
        Reading state information... Done
        rubygems is already the newest version.
        0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
        root at server-713:/var/www/coquelicot# less INSTALL 
        root at server-713:/var/www/coquelicot# gem install bundler
        Successfully installed bundler-1.3.5
        1 gem installed
        Installing ri documentation for bundler-1.3.5...
        Installing RDoc documentation for bundler-1.3.5...
        root at server-713:/var/www/coquelicot# bundle install --deployment
        Fetching gem metadata from https://rubygems.org/.........
        Fetching gem metadata from https://rubygems.org/..
        Installing rake (10.0.3) 
        Installing activesupport (3.0.0) 
        Installing active_support (3.0.0) 
        Installing backports (3.1.0) 
        Installing mime-types (1.17.2) 
        Installing nokogiri (1.5.0) 
        Gem::Installer::ExtensionBuildError: ERROR: Failed to build gem
        native extension.
        
                /usr/bin/ruby1.9.1 extconf.rb 
        /usr/lib/ruby/1.9.1/rubygems/custom_require.rb:36:in `require':
        cannot load such file -- mkmf (LoadError)
        from /usr/lib/ruby/1.9.1/rubygems/custom_require.rb:36:in
        `require'
        from extconf.rb:5:in `<main>'
        
        
        Gem files will remain installed
        in /srv/www/coquelicot/vendor/bundle/ruby/1.9.1/gems/nokogiri-1.5.0 for inspection.
        Results logged
        to /srv/www/coquelicot/vendor/bundle/ruby/1.9.1/gems/nokogiri-1.5.0/ext/nokogiri/gem_make.out
        An error occurred while installing nokogiri (1.5.0), and Bundler
        cannot
        continue.
        Make sure that `gem install nokogiri -v '1.5.0'` succeeds before
        bundling.
        root at server-713:/var/www/coquelicot# 

What does this error mean?

PS : Is this mailing-list english or french?
-------------- next part --------------
A non-text attachment was scrubbed...
Name: signature.asc
Type: application/pgp-signature
Size: 836 bytes
Desc: This is a digitally signed message part
URL: <http://listes.potager.org/pipermail/coquelicot/attachments/20130703/c7b05ea9/attachment.pgp>