我设法在本地安装它没有任何问题，但在我的 VPN 上我根本无法遵循指南。执行在 gem install rails -v 3.2.3 处停止，出现一个我在谷歌搜索数小时后似乎无法修复的错误。
gem install rails -v 3.2.3
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Fetching: i18n-0.6.0.gem (100%)
Fetching: multi_json-1.3.6.gem (100%)
Fetching: activesupport-3.2.3.gem (100%)
Fetching: builder-3.0.0.gem (100%)
Fetching: activemodel-3.2.3.gem (100%)
Fetching: rack-1.4.1.gem (100%)
Fetching: rack-cache-1.2.gem (100%)
Fetching: rack-test-0.6.1.gem (100%)
Fetching: journey-1.0.4.gem (100%)
Fetching: hike-1.2.1.gem (100%)
Fetching: tilt-1.3.3.gem (100%)
Fetching: sprockets-2.1.3.gem (100%)
Fetching: erubis-2.7.0.gem (100%)
Fetching: actionpack-3.2.3.gem (100%)
Fetching: arel-3.0.2.gem (100%)
Fetching: tzinfo-0.3.33.gem (100%)
Fetching: activerecord-3.2.3.gem (100%)
Fetching: activeresource-3.2.3.gem (100%)
Fetching: mime-types-1.19.gem (100%)
Fetching: polyglot-0.3.3.gem (100%)
Fetching: treetop-1.4.10.gem (100%)
Fetching: mail-2.4.4.gem (100%)
Fetching: actionmailer-3.2.3.gem (100%)
Fetching: thor-0.14.6.gem (100%)
Fetching: rack-ssl-1.3.2.gem (100%)
Fetching: json-1.7.4.gem (100%)
Building native extensions. This could take a while...
ERROR: Error installing rails:
ERROR: Failed to build gem native extension.
/home/app-user/.rvm/rubies/ruby-1.9.3-p194/bin/ruby extconf.rb
creating Makefile
make
compiling generator.c
generator.c: In function 'isArrayOrObject':
generator.c:867:5: warning: suggest parentheses around '&&' within '||'
linking shared-object json/ext/generator.so
make install
/usr/bin/install -c -m 0755 generator.so /home/app-user/.rvm/gems/ruby-1.9.3-p194/gems/json-1.7.4/lib/json/ext
installing default generator libraries
Gem files will remain installed in /home/app-user/.rvm/gems/ruby-1.9.3-p194/gems/json-1.7.4 for inspection.
Results logged to /home/app-user/.rvm/gems/ruby-1.9.3-p194/gems/json-1.7.4/ext/json/ext/generator/gem_make.out
我正在使用的指南：http ://ryanbigg.com/2010/12/ubuntu-ruby-rvm-rails-and-you/ 我也尝试了其他指南。弹出同样的错误。有任何想法吗？