相关疑难解决方法(0)

我一直在努力解决这个问题.

我在Snow Leopard机器上安装了Rails 3,gem,mysql.一切顺利,直到我创建了我的第一个项目并试图运行

rails server

运行这个我得到:

jontybrook$ rails server
/Library/Ruby/Gems/1.8/gems/mysql2-0.2.6/lib/mysql2/mysql2.bundle: dlopen(/Library/Ruby/Gems/1.8/gems/mysql2-0.2.6/lib/mysql2/mysql2.bundle, 9): Library not loaded: libmysqlclient.16.dylib (LoadError)
  Referenced from: /Library/Ruby/Gems/1.8/gems/mysql2-0.2.6/lib/mysql2/mysql2.bundle
  Reason: image not found - /Library/Ruby/Gems/1.8/gems/mysql2-0.2.6/lib/mysql2/mysql2.bundle
    from /Library/Ruby/Gems/1.8/gems/mysql2-0.2.6/lib/mysql2.rb:7
    from /Library/Ruby/Gems/1.8/gems/bundler-1.0.7/lib/bundler/runtime.rb:64:in `require'
    from /Library/Ruby/Gems/1.8/gems/bundler-1.0.7/lib/bundler/runtime.rb:64:in `require'
    from /Library/Ruby/Gems/1.8/gems/bundler-1.0.7/lib/bundler/runtime.rb:62:in `each'
    from /Library/Ruby/Gems/1.8/gems/bundler-1.0.7/lib/bundler/runtime.rb:62:in `require'
    from /Library/Ruby/Gems/1.8/gems/bundler-1.0.7/lib/bundler/runtime.rb:51:in `each'
    from /Library/Ruby/Gems/1.8/gems/bundler-1.0.7/lib/bundler/runtime.rb:51:in `require'
    from /Library/Ruby/Gems/1.8/gems/bundler-1.0.7/lib/bundler.rb:112:in `require'
    from /Users/jontybrook/Dropbox/CODING/simple_cms/config/application.rb:7
    from /Library/Ruby/Gems/1.8/gems/railties-3.0.3/lib/rails/commands.rb:28:in `require'
    from /Library/Ruby/Gems/1.8/gems/railties-3.0.3/lib/rails/commands.rb:28
    from /Library/Ruby/Gems/1.8/gems/railties-3.0.3/lib/rails/commands.rb:27:in `tap'
    from /Library/Ruby/Gems/1.8/gems/railties-3.0.3/lib/rails/commands.rb:27
    from script/rails:6:in `require'
    from script/rails:6
jontybrook$ 

据我所知,问题在于mysql2 gem.MySQL似乎运行正常,我的Gemfile引用了mysql2,我的database.yml文件似乎还可以.

错误提到

Reason: image not found - /Library/Ruby/Gems/1.8/gems/mysql2-0.2.6/lib/mysql2/mysql2.bundle

但是

jontybrook$ cd …

我刚刚将我的Macbook更新为Mountain Lion,但现在我无法安装一些宝石,因为下面有关于标题的错误.我环顾四周,似乎与Ruby标头缺失有关.有人建议安装Xcode,所以我从应用程序商店和Xcode命令行工具安装了完整的Xcode.但仍然没有运气.有什么建议？

ERROR: Failed to build gem native extension. (Gem::Installer::ExtensionBuildError)
checking for ffi.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.

我在我的机器上安装mysql2 gem时遇到了麻烦.

我有OS X 10.8和最新的Xcode,以及通过Homebrew安装的mySql.使用最新RVM安装的所有rubies.

我可以在ruby 2.0.0-p195下安装mysql2

[~]$ rvm use 2.0.0                                                              [ruby-1.9.3-p429]
Using /Users/aselder/.rvm/gems/ruby-2.0.0-p195
[~]$ gem in mysql2                                                              [ruby-2.0.0-p195]
Fetching: mysql2-0.3.11.gem (100%)
Building native extensions.  This could take a while...
Successfully installed mysql2-0.3.11
1 gem installed

在Ruby 1.9.3和1.8.7下,它找不到mysql.h文件

    [~]$ rvm use 1.9.3                                                              [ruby-1.9.3-p429]
    Using /Users/aselder/.rvm/gems/ruby-1.9.3-p429
    [~]$ gem in mysql2                                                              [ruby-1.9.3-p429]
    Fetching: mysql2-0.3.11.gem (100%)
    Building native extensions.  This could take a while...
    ERROR:  Error installing mysql2:
        ERROR: Failed to build gem native extension.

            /Users/aselder/.rvm/rubies/ruby-1.9.3-p429/bin/ruby extconf.rb
    checking for rb_thread_blocking_region()... yes
    checking for …