我查看了有关 stackoverflow 的多个问题，他们都为该问题提供了不同的解决方案。我 git 克隆了一个 rails 项目，运行 bundle install，并使用 1.9.3 ruby 在 rvm 中创建了一个新的 gemset，并且认为 rails 3.2.13 也将使用 bundle install 命令安装。过去我通过使用本指南解决了这个问题，http://www.randomactsofsentience.com/2013/05/gem-install-mysql2-missing-mysqlh-on-os.html. 我在用户/本地找不到 mysql 文件夹，指南说我需要编辑一个文件并删除一些行来解决 mysql.h 丢失的问题。这个文件不存在了？我没找到？也许我缺少依赖项，但我找到了这些依赖项的 linux 安装方式？也许我需要安装 mysql5.5 而不是最新版本但不确定如何指定？其中哪一个会为我解决这个问题？
Installing mysql2 (0.3.11)
Gem::Installer::ExtensionBuildError: ERROR: Failed to build gem native extension.
/Users/judyngai/.rvm/rubies/ruby-1.9.3-p429/bin/ruby extconf.rb
checking for rb_thread_blocking_region()... yes
checking for rb_wait_for_single_fd()... yes
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
--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/judyngai/.rvm/rubies/ruby-1.9.3-p429/bin/ruby
--with-mysql-config
--without-mysql-config
Gem files will remain installed in /Users/judyngai/.rvm/gems/ruby-1.9.3-p429@spreeversion /gems/mysql2-0.3.11 for inspection.
Results logged to /Users/judyngai/.rvm/gems/ruby-1.9.3-p429@spreeversion/gems/mysql2-0.3.11/ext/mysql2/gem_make.out
An error occurred while installing mysql2 (0.3.11), and Bundler cannot continue.
Make sure that `gem install mysql2 -v '0.3.11'` succeeds before bundling.