安装mysql2 gem失败

Question

我正在尝试在新的Mavericks机器上建立一个不是很老(但仍有几年)的Rails项目。当我尝试bundle时，我一直收到这个错误(很抱歉代码很长)：

Gem::Installer::ExtensionBuildError: ERROR: Failed to build gem native extension.
/Users/royzinn/.rbenv/versions/1.8.7-p352/bin/ruby extconf.rb --with-mysql-config=/usr/local/Cellar/mysql/5.5.20/bin/mysql_config
checking for rb_thread_blocking_region()... no
checking for rb_wait_for_single_fd()... no
checking for mysql.h... no
checking for mysql/mysql.h... no
-----
mysql.h is missing.  please check your installation of mysql and try again.
-----
*** 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=/Users/royzinn/.rbenv/versions/1.8.7-p352/bin/ruby
    --with-mysql-config


Gem files will remain installed in /Users/royzinn/dailyd/vendor/ruby/1.8/gems/mysql2-0.2.18 for     inspection.
Results logged to /Users/royzinn/dailyd/vendor/ruby/1.8/gems/mysql2-0.2.18/ext/mysql2/gem_make.out

在此之前，我收到一条消息，告诉我gem是为MySQL版本5.5.20构建的，并且我已经激活了其他(更高级的) MySQL。

我用Homebrew“清理”了所有东西，尝试重新安装，但似乎什么都不起作用。

任何帮助都是非常感谢的。谢谢!

Answer 1

尝试删除此目录：

/Users/royzinn/dailyd/vendor/ruby/1.8/gems/mysql2-0.2.18  

如果这不能帮助删除rvm目录并重新安装

Answer 2

首先，确保gem可以在安装时编译。

gem install mysql

brew install mysql
gem install mysql2

最后，Gemfile中mysql2 gem的版本可能已经过期，需要更新。

bundle update mysql2