Hi expects, Please give a solution to this problem. I use Ubuntu. I've shown the error like "Make sure that `gem install <gem_name> -v 'x.x.x'` succeeds before bundling." in Windows7 too. selvag@selvag:~/webapp$ bundle install Fetching gem metadata from https://rubygems.org/......... Resolving dependencies... Using rake 10.3.2 Installing i18n 0.6.1 Using multi_json 1.10.1 Installing activesupport 3.2.13 Installing builder 3.0.4 Installing activemodel 3.2.13 Using erubis 2.7.0 Installing journey 1.0.4 Installing rack 1.4.5 Installing rack-cache 1.2 Using rack-test 0.6.2 Using hike 1.2.3 Using tilt 1.4.1 Installing sprockets 2.2.2 Installing actionpack 3.2.13 Using mime-types 1.25.1 Using polyglot 0.3.5 Using treetop 1.4.15 Using mail 2.5.4 Installing actionmailer 3.2.13 Installing arel 3.0.3 Using tzinfo 0.3.41 Installing activerecord 3.2.13 Installing activeresource 3.2.13 Installing addressable 2.3.6 Using json 1.8.1 Installing mini_portile 0.6.0 Installing nokogiri 1.6.3.1 Installing aws-sdk 1.51.0 Using bundler 1.6.2 Using coffee-script-source 1.7.1 Using execjs 2.2.1 Using coffee-script 2.3.0 Installing rack-ssl 1.3.4 Installing rdoc 3.12.2 Using thor 0.19.1 Installing railties 3.2.13 Installing coffee-rails 3.2.2 Installing cookiejar 0.3.2 Installing daemons 1.1.9 Gem::Ext::BuildError: ERROR: Failed to build gem native extension. /home/selvag/.rvm/rubies/ruby-2.0.0-p481/bin/ruby extconf.rb checking for main() in -lIL... no *** 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=/home/selvag/.rvm/rubies/ruby-2.0.0-p481/bin/ruby --with-ILlib --without-ILlib extconf failed, exit code 1 Gem files will remain installed in /home/selvag/.rvm/gems/ruby-2.0.0-p481/gems/devil-0.1.9.5 for inspection. Results logged to /home/selvag/.rvm/gems/ruby-2.0.0-p481/extensions/x86_64-linux/2.0.0/devil-0.1.9.5/gem_make.out An error occurred while installing devil (0.1.9.5), and Bundler cannot continue. Make sure that `gem install devil -v '0.1.9.5'` succeeds before bundling. -- Posted via http://www.ruby-forum.com/. -- You received this message because you are subscribed to the Google Groups "Ruby on Rails: Talk" group. To unsubscribe from this group and stop receiving emails from it, send an email to rubyonrails-talk+unsubscribe-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org To post to this group, send email to rubyonrails-talk-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org To view this discussion on the web visit https://groups.google.com/d/msgid/rubyonrails-talk/5ee5fbe1b811967f79cbde83b4738799%40ruby-forum.com. For more options, visit https://groups.google.com/d/optout.