我第一次尝试安装的Rails 4.0。 在Windows 8中使用Ruby 2.0的x64。 冉：
gem install rails --version 4.0.0.rc1 --no-ri --no-rdoc
然后我运行：
rails new test_app
cd test_app
rails s
但在网页localhost:3000报告以下错误：
指定“sqlite3的”数据库适配器，但没有加载宝石。 添加
gem 'sqlite3'你的Gemfile。
它的存在在我的Gemfile：
gem 'sqlite3'
我试图运行bundle install好几次，它甚至不列出它的所有其他宝石之一。
更新 ：我已经尝试了两种不同的方式安装sqlite3的宝石，无论是使用从该的devkit文件msys.bat打开终端。 下面@szines提到的方式给了我以下错误：
$ gem install sqlite3 --platform=ruby -- --with-opt-dir=c:/sqlite-amalgamation-3071602
Temporarily enhancing PATH to include DevKit...
Building native extensions with: '--with-opt-dir=c:/sqlite-amalgamation-3071602'
This could take a while...
ERROR: Error installing sqlite3:
ERROR: Failed to build gem native extension.
c:/Ruby200-x64/bin/ruby.exe extconf.rb --with-opt-dir=c:/sqlite-amalgamation-3071602
checking for sqlite3.h... yes
checking for sqlite3_libversion_number()... -lsqlite3
sqlite3 is missing. Install SQLite3 from http://www.sqlite.org/ first.
*** 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=c:/Ruby200-x64/bin/ruby
--with-sqlite3-dir
--without-sqlite3-dir
--with-sqlite3-include
--without-sqlite3-include=${sqlite3-dir}/include
--with-sqlite3-lib
--without-sqlite3-lib=${sqlite3-dir}/
--enable-local
--disable-local
--with-sqlite3lib
--without-sqlite3lib
Gem files will remain installed in c:/Ruby200-x64/lib/ruby/gems/2.0.0/gems/sqlite3-1.3.7 for inspection.
Results logged to c:/Ruby200-x64/lib/ruby/gems/2.0.0/gems/sqlite3-1.3.7/ext/sqlite3/gem_make.out
另一种方法，我用从sqlite.org autoconf的包，我能够编译和安装sqlite3的宝石。 然而，当我尝试打开Rails服务器我得到以下错误：
C:\Users\me\RubymineProjects\my_project>rails s
C:/Ruby200-x64/lib/ruby/gems/2.0.0/gems/sqlite3-1.3.7/lib/sqlite3.rb:6:in `require': cannot load such file -- sqlite3/sqlite3_native (LoadError)
from C:/Ruby200-x64/lib/ruby/gems/2.0.0/gems/sqlite3-1.3.7/lib/sqlite3.rb:6:in `rescue in <top (required)>'
from C:/Ruby200-x64/lib/ruby/gems/2.0.0/gems/sqlite3-1.3.7/lib/sqlite3.rb:2:in `<top (required)>'
from C:/Ruby200-x64/lib/ruby/gems/2.0.0/gems/bundler-1.3.5/lib/bundler/runtime.rb:72:in `require'
from C:/Ruby200-x64/lib/ruby/gems/2.0.0/gems/bundler-1.3.5/lib/bundler/runtime.rb:72:in `block (2 levels) in require'
from C:/Ruby200-x64/lib/ruby/gems/2.0.0/gems/bundler-1.3.5/lib/bundler/runtime.rb:70:in `each'
from C:/Ruby200-x64/lib/ruby/gems/2.0.0/gems/bundler-1.3.5/lib/bundler/runtime.rb:70:in `block in require'
from C:/Ruby200-x64/lib/ruby/gems/2.0.0/gems/bundler-1.3.5/lib/bundler/runtime.rb:59:in `each'
from C:/Ruby200-x64/lib/ruby/gems/2.0.0/gems/bundler-1.3.5/lib/bundler/runtime.rb:59:in `require'
from C:/Ruby200-x64/lib/ruby/gems/2.0.0/gems/bundler-1.3.5/lib/bundler.rb:132:in `require'
from C:/Users/me/RubymineProjects/my_project/config/application.rb:7:in `<top (required)>'
from C:/Ruby200-x64/lib/ruby/gems/2.0.0/gems/railties-4.0.0.rc1/lib/rails/commands.rb:78:in `require'
from C:/Ruby200-x64/lib/ruby/gems/2.0.0/gems/railties-4.0.0.rc1/lib/rails/commands.rb:78:in `block in <top (required)>'
from C:/Ruby200-x64/lib/ruby/gems/2.0.0/gems/railties-4.0.0.rc1/lib/rails/commands.rb:75:in `tap'
from C:/Ruby200-x64/lib/ruby/gems/2.0.0/gems/railties-4.0.0.rc1/lib/rails/commands.rb:75:in `<top (required)>'
from bin/rails:4:in `require'
from bin/rails:4:in `<main>'
