执行Bundle安装时MySql出错

当我执行Bundle Install时,出现以下错误：

Installing MysqL2 (0.3.10) with native extensions 
Gem::Installer::ExtensionBuildError: ERROR: Failed to build gem native extension.

    /Users/manish/.rvm/rubies/ruby-1.9.2-p290/bin/ruby extconf.rb 
checking for rb_thread_blocking_region()... yes
checking for rb_wait_for_single_fd()... no
*** 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/manish/.rvm/rubies/ruby-1.9.2-p290/bin/ruby
--with-MysqL-config
--without-MysqL-config
extconf.rb:33:in ``': No such file or directory - /usr/local/bin/MysqL_config --cflags    (Errno::ENOENT)
from extconf.rb:33:in `<main>'


Gem files will remain installed in /Users/manish/.rvm/gems/ruby-1.9.2-p290/gems/MysqL2- 0.3.10 for inspection.
Results logged to /Users/manish/.rvm/gems/ruby-1.9.2-p290/gems/MysqL2-  0.3.10/ext/MysqL2/gem_make.out
An error occured while installing MysqL2 (0.3.10), and Bundler cannot continue.
Make sure that `gem install MysqL2 -v '0.3.10'` succeeds before bundling.

在Gemfile中,MysqL是这样的：

gem "MysqL2", ">=0.3.0"

当我还尝试使用brew后跟sudo安装MysqL时会出现以下错误：

 sudo: unable to execute /usr/local/bin/brew: Permission denied

我该如何解决这个问题？

解决方法:

我找到了我的解决方案,这里是：

第1步：清理以前安装的rvm和Xcode

    => rm -rf ~/.rvm    
    => sudo rm -rf /Developer

步骤2：从App Store安装Xcode,或者安装程序可能会保存在Launchpad中.

第3步：安装HomeBrew：

    => mkdir -p /usr/local/Cellar
    => /usr/bin/ruby -e "$(curl -fsSL https://raw.github.com/gist/323731)"

第4步：安装RVM

    => bash < <(curl -s https://rvm.beginrescueend.com/install/rvm)
    => echo '[[ -s "$HOME/.rvm/scripts/rvm" ]] && . "$HOME/.rvm/scripts/rvm" #  Load RVM function' >> ~/.bash_profile

第5步：安装Ruby 1.9.2

    => rvm install 1.9.2
    => rvm use ruby-1.9.2 --default
    => gem install rails thin bundler
    => rvm install 1.9.2-head
    => brew install git ack wget curl redis memcached libmemcached colordiff imagemagick

第6步：安装MysqL

    => brew install MysqL
    => MysqL_install_db --verbose --user=`whoami` --basedir="$(brew --prefix MysqL)" --datadir=/usr/local/var/MysqL --tmpdir=/tmp
    => mkdir -p ~/Library/LaunchAgents
    => cp /usr/local/Cellar/MysqL/5.5.15/com.MysqL.MysqLd.plist ~/Library/LaunchAgents/
    => launchctl load -w ~/Library/LaunchAgents/com.MysqL.MysqLd.plist
    => MysqL -u root
    => UPDATE MysqL.user SET Password=PASSWORD('password') WHERE User='root';
    => FLUSH PRIVILEGES;