我正在尝试在 cygwin 上的 rails 上安装 ruby，但在创建测试应用程序时遇到了障碍，例如，
rails new my_test_app
看起来我的安装（ruby 1.9.3p429 (2013-05-15) [i386-cygwin], rails 3.2.13, gem 2.0.6, rake 10.1.0）缺少一个 gem -> sqlite3-ruby。现在找不到头文件（sqlite3.h），我无法指定 gem 可以理解的配置选项。有人可以帮我吗？
$ rails new test_ror_app1
create
create README.rdoc
create Rakefile
create config.ru
create .gitignore
create Gemfile
create app
create app/assets/images/rails.png
create app/assets/javascripts/application.js
create app/assets/stylesheets/application.css
create app/controllers/application_controller.rb
create app/helpers/application_helper.rb
create app/views/layouts/application.html.erb
create app/mailers/.gitkeep
create app/models/.gitkeep
create config
create config/routes.rb
create config/application.rb
create config/environment.rb
create config/environments
create config/environments/development.rb
create config/environments/production.rb
create config/environments/test.rb
create config/initializers
create config/initializers/backtrace_silencers.rb
create config/initializers/inflections.rb
create config/initializers/mime_types.rb
create config/initializers/secret_token.rb
create config/initializers/session_store.rb
create config/initializers/wrap_parameters.rb
create config/locales
create config/locales/en.yml
create config/boot.rb
create config/database.yml
create db
create db/seeds.rb
create doc
create doc/README_FOR_APP
create lib
create lib/tasks
create lib/tasks/.gitkeep
create lib/assets
create lib/assets/.gitkeep
create log
create log/.gitkeep
create public
create public/404.html
create public/422.html
create public/500.html
create public/favicon.ico
create public/index.html
create public/robots.txt
create script
create script/rails
create test/fixtures
create test/fixtures/.gitkeep
create test/functional
create test/functional/.gitkeep
create test/integration
create test/integration/.gitkeep
create test/unit
create test/unit/.gitkeep
create test/performance/browsing_test.rb
create test/test_helper.rb
create tmp/cache
create tmp/cache/assets
create vendor/assets/javascripts
create vendor/assets/javascripts/.gitkeep
create vendor/assets/stylesheets
create vendor/assets/stylesheets/.gitkeep
create vendor/plugins
create vendor/plugins/.gitkeep
run bundle install
Fetching gem metadata from https://rubygems.org/...........
Fetching gem metadata from https://rubygems.org/..
Resolving dependencies...
Using rake (10.1.0)
Using i18n (0.6.1)
Using multi_json (1.7.7)
Using activesupport (3.2.13)
Using builder (3.0.4)
Using activemodel (3.2.13)
Using erubis (2.7.0)
Using journey (1.0.4)
Using rack (1.4.5)
Using rack-cache (1.2)
Using rack-test (0.6.2)
Using hike (1.2.3)
Using tilt (1.4.1)
Using sprockets (2.2.2)
Using actionpack (3.2.13)
Using mime-types (1.23)
Using polyglot (0.3.3)
Using treetop (1.4.14)
Using mail (2.5.4)
Using actionmailer (3.2.13)
Using arel (3.0.2)
Using tzinfo (0.3.37)
Using activerecord (3.2.13)
Using activeresource (3.2.13)
Using bundler (1.3.5)
Using coffee-script-source (1.6.3)
Using execjs (1.4.0)
Using coffee-script (2.2.0)
Using rack-ssl (1.3.3)
Using json (1.8.0)
Using rdoc (3.12.2)
Using thor (0.18.1)
Using railties (3.2.13)
Using coffee-rails (3.2.2)
Using jquery-rails (3.0.4)
Using rails (3.2.13)
Using sass (3.2.10)
Using sass-rails (3.2.6)
Installing sqlite3 (1.3.7)
Gem::Installer::ExtensionBuildError: ERROR: Failed to build gem native extension
.
/usr/bin/ruby.exe extconf.rb
checking for sqlite3.h... *** 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}/
--with-make-prog
--without-make-prog
--srcdir=.
--curdir
--ruby=/usr/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
/usr/lib/ruby/1.9.1/mkmf.rb:381:in `try_do': The compiler failed to generate an
executable file. (RuntimeError)
You have to install development tools first.
from /usr/lib/ruby/1.9.1/mkmf.rb:506:in `try_cpp'
from /usr/lib/ruby/1.9.1/mkmf.rb:970:in `block in find_header'
from /usr/lib/ruby/1.9.1/mkmf.rb:790:in `block in checking_for'
from /usr/lib/ruby/1.9.1/mkmf.rb:284:in `block (2 levels) in postpone'
from /usr/lib/ruby/1.9.1/mkmf.rb:254:in `open'
from /usr/lib/ruby/1.9.1/mkmf.rb:284:in `block in postpone'
from /usr/lib/ruby/1.9.1/mkmf.rb:254:in `open'
from /usr/lib/ruby/1.9.1/mkmf.rb:280:in `postpone'
from /usr/lib/ruby/1.9.1/mkmf.rb:789:in `checking_for'
from /usr/lib/ruby/1.9.1/mkmf.rb:969:in `find_header'
from extconf.rb:34:in `<main>'
Gem files will remain installed in /usr/lib/ruby/gems/1.9.1/gems/sqlite3-1.3.7 f
or inspection.
Results logged to /usr/lib/ruby/gems/1.9.1/gems/sqlite3-1.3.7/ext/sqlite3/gem_ma
ke.out
An error occurred while installing sqlite3 (1.3.7), and Bundler cannot continue.
Make sure that `gem install sqlite3 -v '1.3.7'` succeeds before bundling.
这已成功完成，如下所示：
$ gem install sqlite3 -v '1.3.7'
Successfully installed sqlite3-1.3.7-x86-mswin32-60
1 gem installed
当我重试创建新的测试应用程序时，与上面（第一次）相同的错误重复。
请帮我解决这个问题。TIA。
更新 [1]：mkmf.log 揭示了这一点：
/usr/lib/gcc/i686-pc-cygwin/4.7.3/../../../../i686-pc-cygwin/bin/ld: cannot find -lcrypt