Rails4，Ruby2，MySLQ2和RubyMine

Question

我和所有人都收到了相同的错误消息，但是我在Mac（10.8）上，使用Rails4，Ruby2和RubyMine（IDE）。

/Users/eric/.rvm/rubies/ruby-2.0.0-p195/bin/ruby -e $stdout.sync=true;$stderr.sync=true;load($0=ARGV.shift) /Users/eric/Rubymine/Chroma/bin/bundle install
Fetching gem metadata from https://rubygems.org/........
Fetching gem metadata from https://rubygems.org/..
Resolving dependencies...
...
...
...
Installing mysql2 (0.3.11) 
Gem::Installer::ExtensionBuildError: ERROR: Failed to build gem native extension.

/Users/eric/.rvm/rubies/ruby-2.0.0-p195/bin/ruby extconf.rb 
checking for rb_thread_blocking_region()... yes
checking for rb_wait_for_single_fd()... yes
checking for mysql_query() in -lmysqlclient... no
checking for main() in -lm... yes
checking for mysql_query() in -lmysqlclient... no
checking for main() in -lz... yes
checking for mysql_query() in -lmysqlclient... no
checking for main() in -lsocket... no
checking for mysql_query() in -lmysqlclient... no
checking for main() in -lnsl... no
checking for mysql_query() in -lmysqlclient... no
checking for main() in -lmygcc... no
checking for mysql_query() in -lmysqlclient... 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
--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/eric/.rvm/rubies/ruby-2.0.0-p195/bin/ruby
--with-mysql-config
--without-mysql-config
--with-mysql-dir
--without-mysql-dir
--with-mysql-include
--without-mysql-include=${mysql-dir}/include
--with-mysql-lib
--without-mysql-lib=${mysql-dir}/
--with-mysqlclientlib
--without-mysqlclientlib
--with-mlib
--without-mlib
--with-mysqlclientlib
--without-mysqlclientlib
--with-zlib
--without-zlib
--with-mysqlclientlib
--without-mysqlclientlib
--with-socketlib
--without-socketlib
--with-mysqlclientlib
--without-mysqlclientlib
--with-nsllib
--without-nsllib
--with-mysqlclientlib
--without-mysqlclientlib
--with-mygcclib
--without-mygcclib
--with-mysqlclientlib
--without-mysqlclientlib

Gem files will remain installed in /Users/eric/.rvm/gems/ruby-2.0.0-p195@global/gems/mysql2-0.3.11 for inspection.
Results logged to /Users/eric/.rvm/gems/ruby-2.0.0-p195@global/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.

Process finished with exit code 5

我也在网上尝试了许多其他操作：-从命令行运行gem install mysql2会得到与上述相同的消息。 -运行gem 'mysql2'时出现此错误： ERROR: While executing gem ... (Gem::CommandLineError) Unknown command mysql2即使我将其保存为我的Gemfile： http ://d.pr/n/jc3i-我已经尝试添加rvm install libmysql-ruby希望可以解决它..不。

我应该提到的是，这是我对RoR的首次真正尝试，因此很有可能是我遇到的问题...我在StackOverflow上四处张望，那里也没有任何运气。 任何帮助将不胜感激。

Answer 1

我曾经经常遇到这个问题。 您是否尝试过针对MySQL安装来安装gem：

env ARCHFLAGS="-arch x86_64" gem install mysql2 -- --with-mysql-dir=/usr/local/mysql

（请注意双双破折号……它们是故意的）

当然，您的MySQL安装可能在其他地方，因此请进行相应调整。

我还记得必须重新链接libmysqlclient.18.dylib，但这可能不再必要了。 供参考，它像这样：

sudo install_name_tool -change libmysqlclient.18.dylib /usr/local/mysql/lib/libmysqlclient.18.dylib /Users/levifig/.rvm/gems/ruby-1.9.3-p125/gems/mysql2-0.3.11/lib/mysql2/mysql2.bundle

希望这能为您指明正确的方向。 如果没有，我还是会尽力帮助... :)