错误信息：
Building native extensions. This could take a while...
ERROR: Error installing rails:
ERROR: Failed to build gem native extension.
/usr/bin/ruby2.1 -r ./siteconf20150328-1540-hff2f0.rb extconf.rb
checking if the C compiler accepts ... *** 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=/usr/bin/ruby2.1
--help
--clean
/usr/lib/ruby/2.1.0/mkmf.rb:456:in `try_do': The compiler failed to generate an executable file. (RuntimeError)
You have to install development tools first.
from /usr/lib/ruby/2.1.0/mkmf.rb:571:in `block in try_compile'
from /usr/lib/ruby/2.1.0/mkmf.rb:522:in `with_werror'
from /usr/lib/ruby/2.1.0/mkmf.rb:571:in `try_compile'
from extconf.rb:80:in `nokogiri_try_compile'
from extconf.rb:87:in `block in add_cflags'
from /usr/lib/ruby/2.1.0/mkmf.rb:621:in `with_cflags'
from extconf.rb:86:in `add_cflags'
from extconf.rb:337:in `<main>'
extconf failed, exit code 1
Gem files will remain installed in /var/lib/gems/2.1.0/gems/nokogiri-1.6.6.2 for inspection.
Results logged to /var/lib/gems/2.1.0/extensions/x86_64-linux/2.1.0/nokogiri-1.6.6.2/gem_make.out
配置：
- Ubuntu 14.10（GNU/Linux 3.16.0-23-通用 x86_64）
- 海湾合作委员会（Ubuntu 4.9.1-16ubuntu6）4.9.1
- 红宝石 2.1.2p95 (2014-05-08) [x86_64-linux-gnu]
使用 RVM 在 Ubuntu 14.04 上升级到 Rails 4.2.4 后，我需要执行以下操作：
sudo apt-get install libgmp-dev
or
sudo apt-get install libgmp3-dev
完整的堆栈跟踪：http://ruby-on-rails-eq8.blogspot.co.uk/2015/10/solving-ubuntu-1404-ruby-c-dependancy.html http://ruby-on-rails-eq8.blogspot.co.uk/2015/10/solving-ubuntu-1404-ruby-c-dependancy.html
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