blocks|key|743966|text|您需要在安装libmysqlclient-dev+gem之前安装mysql2：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|743967|sudo+apt-get+install+libmysqlclient-dev
gem+install+mysql2|code-block|syntax|javascript|743968|这应该可以在最新的Ubuntu版本上解决这个问题。|743969|entityMap^0|6|I|W|6|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@$9|P|A|Q|B|C]|$9|R|A|S|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|T|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|U|8|@]|D|@]|E|$]]|$1|M|3|-4|5|6|7|V|8|@]|D|@]|E|$]]]|N|$]]

You need to install <code>libmysqlclient-dev</code> before installing the <code>mysql2</code> gem:

<pre><code>sudo apt-get install libmysqlclient-dev
gem install mysql2
</code></pre>

This should fix this problem on the latest Ubuntu versions.

blocks|key|744053|text|感谢安德烈·施威瑟夫|type|unstyled|depth|inlineStyleRanges|entityRanges|data|744054|sudo+apt-get+install+libmysqlclient-dev
gem+install+mysql2

..
bundle+update
bundle+install|code-block|syntax|javascript|744055|完了！|744056|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

Thank Andre Schweighofer, just to it

<pre><code>sudo apt-get install libmysqlclient-dev
gem install mysql2

..
bundle update
bundle install
</code></pre>

DONE !!!

blocks|key|2860885|text|它需要安装mysql开发包。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2860886|yum+install+mysql-devel|code-block|syntax|javascript|2860887|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

It require to install mysql development package

<pre><code>yum install mysql-devel
</code></pre>

blocks|key|2860778|text|在这里使用搜索是很有帮助的;)：ruby-mysql|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|2860779|)具有相同问题的另一个线程：ruby-mysql2|2860780|当你搜索“红宝石mysql2”或者类似的东西时，你会发现更多。|2860781|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/questions/3608287/installing-mysql2-gem-for-rails-3|1|https://stackoverflow.com/questions/3655923/ruby-gem-mysql2-install-error^0|G|A|0|0|E|B|1|0|0^^$0|@$1|2|3|4|5|6|7|R|8|@]|9|@$A|S|B|T|1|U]]|C|$]]|$1|D|3|E|5|6|7|V|8|@]|9|@$A|W|B|X|1|Y]]|C|$]]|$1|F|3|G|5|6|7|Z|8|@]|9|@]|C|$]]|$1|H|3|-4|5|6|7|10|8|@]|9|@]|C|$]]]|I|$J|$5|K|L|M|C|$N|O]]|P|$5|K|L|M|C|$N|Q]]]]

Its helful to use the search here ;): <a href="https://stackoverflow.com/questions/3608287/installing-mysql2-gem-for-rails-3">ruby-mysql</a>

here is another thread ;) with the same problem: <a href="https://stackoverflow.com/questions/3655923/ruby-gem-mysql2-install-error">ruby-mysql2</a>

and many more when you search for "ruby mysql2" or something like this.

blocks|key|743974|text|造成这种失败的原因是多方面的：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|743975|红宝石和红宝石之间的|743976|坏版本兼容性|ordered-list-item|743977|缺失的|743978|没有在64位系统|743979|上定位|743980|Mysql+32位|unordered-list-item|743981|743982|解决方案|743983|​|743984|743985|安装具有最新稳定版本的rvm，您可以通过rvm在ruby版本|743986|之间切换。|743987|curl+-L+https://get.rvm.io+%7C+bash+-s+stable|offset|length|style|CODE|743988|743989|安装依赖关系|743990|743991|sudo+apt-get+install+libmysqlclient-dev|743992|gem+install+mysql+--+--with-mysql-config=/path/to/mysql_config|743993|Install+|743994|在系统上定位mysql_config+(查找/+-name+mysql_config)，并为系统|743995|运行mysql_config+64位版本的mysql|743996|743997|743998|entityMap^0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|17|0|0|0|0|0|13|0|0|1Q|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|1N|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|1O|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|1P|8|@]|9|@]|A|$]]|$1|G|3|H|5|F|7|1Q|8|@]|9|@]|A|$]]|$1|I|3|J|5|F|7|1R|8|@]|9|@]|A|$]]|$1|K|3|L|5|6|7|1S|8|@]|9|@]|A|$]]|$1|M|3|N|5|O|7|1T|8|@]|9|@]|A|$]]|$1|P|3|-4|5|6|7|1U|8|@]|9|@]|A|$]]|$1|Q|3|R|5|6|7|1V|8|@]|9|@]|A|$]]|$1|S|3|T|5|6|7|1W|8|@]|9|@]|A|$]]|$1|U|3|-4|5|6|7|1X|8|@]|9|@]|A|$]]|$1|V|3|W|5|F|7|1Y|8|@]|9|@]|A|$]]|$1|X|3|Y|5|6|7|1Z|8|@]|9|@]|A|$]]|$1|Z|3|10|5|6|7|20|8|@$11|21|12|22|13|14]]|9|@]|A|$]]|$1|15|3|-4|5|6|7|23|8|@]|9|@]|A|$]]|$1|16|3|17|5|F|7|24|8|@]|9|@]|A|$]]|$1|18|3|-4|5|6|7|25|8|@]|9|@]|A|$]]|$1|19|3|1A|5|6|7|26|8|@$11|27|12|28|13|14]]|9|@]|A|$]]|$1|1B|3|1C|5|6|7|29|8|@$11|2A|12|2B|13|14]]|9|@]|A|$]]|$1|1D|3|1E|5|O|7|2C|8|@]|9|@]|A|$]]|$1|1F|3|1G|5|F|7|2D|8|@]|9|@]|A|$]]|$1|1H|3|1I|5|6|7|2E|8|@]|9|@]|A|$]]|$1|1J|3|-4|5|6|7|2F|8|@]|9|@]|A|$]]|$1|1K|3|T|5|6|7|2G|8|@]|9|@]|A|$]]|$1|1L|3|-4|5|6|7|2H|8|@]|9|@]|A|$]]]|1M|$]]

These are multiple causes of this failure : 

<ol>
<li>Bad versions compatibility between ruby and rubygems </li>
<li>Missing libmysqlclient-dev</li>
<li>gem not locating the </li>
<li>Mysql 32bit on a 64 bit system</li>
</ol>

Solutions

<ol>
<li>Install rvm with latest stable release, You can switch after via rvm between ruby versions

<blockquote>
 <code>curl -L https://get.rvm.io | bash -s stable</code>
</blockquote></li>
<li>Install the dependecy

<blockquote>
 <code>sudo apt-get install libmysqlclient-dev</code>
</blockquote></li>
<li>locate mysql_config on your system (find / -name mysql_config) and run 

<blockquote>
 <code>gem install mysql -- --with-mysql-config=/path/to/mysql_config</code></li>
 <li>Install the 64 bit version of mysql for your system </li>
 </ol>
</blockquote>

blocks|key|2860941|text|这可能是因为mysql更新了二进制文件(在我的例子中，它使用的是MariaDB10.0.31+)，并且在安装缺少的库(+libmysqlclient-dev+)时，我得到了以下消息，这是无法解决的：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2860942|$+sudo+apt-get+install+libmysqlclient-dev

Reading+package+lists...+Done
Building+dependency+tree+++++++
Reading+state+information...+Done
Some+packages+could+not+be+installed.+This+may+mean+that+you+have
requested+an+impossible+situation+or+if+you+are+using+the+unstable
distribution+that+some+required+packages+have+not+yet+been+created
or+been+moved+out+of+Incoming.
The+following+information+may+help+to+resolve+the+situation:

The+following+packages+have+unmet+dependencies:
+libmysqlclient-dev+:+Depends:+libmysqlclient18+(=+5.5.58-0ubuntu0.14.04.1)|code-block|syntax|javascript|2860943|但我解决了上述问题，首先将libmariadbclient-dev安装为：|offset|length|style|BOLD|2860944|+$+sudo+apt-get+install+libmariadbclient-dev|2860945|它还将安装libmysqlclient-dev，但首先要解决mariadb依赖关系。|2860946|entityMap^0|0|0|D|K|0|0|5|I|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|T|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|U|8|@$I|V|J|W|K|L]]|9|@]|A|$]]|$1|M|3|N|5|D|7|X|8|@]|9|@]|A|$E|F]]|$1|O|3|P|5|6|7|Y|8|@$I|Z|J|10|K|L]]|9|@]|A|$]]|$1|Q|3|-4|5|6|7|11|8|@]|9|@]|A|$]]]|R|$]]

It could be due to mysql updated binary ( In my case it was using Mariadb-10.0.31) and on installing the missing library( libmysqlclient-dev ), I got the following message that it would be impossible to resolve:

<pre><code>$ sudo apt-get install libmysqlclient-dev

Reading package lists... Done
Building dependency tree 
Reading state information... Done
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:

The following packages have unmet dependencies:
 libmysqlclient-dev : Depends: libmysqlclient18 (= 5.5.58-0ubuntu0.14.04.1)
</code></pre>

But I resolved the above issue by first installing libmariadbclient-dev as:-

<pre><code> $ sudo apt-get install libmariadbclient-dev
</code></pre>

It will install libmysqlclient-dev as well but by first resolving mariadb dependency.

blocks|key|2860865|text|在Ubuntu10.10上，我不得不安装libmysqlclient16-dev。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2860866|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

On Ubuntu 10.10, I had to install libmysqlclient16-dev.

blocks|key|2860904|text|我解决的方法是检查mkmf.log，在我的例子中，它在mkmf.log的某个地方|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2860905|在我的例子中，有一个错误，它找不到-lgmp，所以它缺少了gmp库，所以是通过apt-get安装的，在本例中是libgmp-dev。|2860906|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|F|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|G|8|@]|9|@]|A|$]]|$1|D|3|-4|5|6|7|H|8|@]|9|@]|A|$]]]|E|$]]

The way I solved was to inspect the mkmf.log, which in my case was somewhere in 
./gems/ruby-2.2.3/extensions/x86_64-linux/2.2.0/mysql2-0.4.2/mkmf.log

In my case, there was an error that it could not find -lgmp, so it was missing the gmp library , so installed via apt-get , in this case libgmp-dev.

I got this error:

<pre><code>sudo gem install mysql2
Building native extensions. This could take a while...
ERROR: Error installing mysql2:
 ERROR: Failed to build gem native extension.

/usr/bin/ruby1.8 extconf.rb
checking for rb_thread_blocking_region()... 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=/usr/bin/ruby1.8
 --with-mysql-config
 --without-mysql-config


Gem files will remain installed in /var/lib/gems/1.8/gems/mysql2-0.2.6 for inspection.
Results logged to /var/lib/gems/1.8/gems/mysql2-0.2.6/ext/mysql2/gem_make.out
</code></pre>

I have tried:

<ul>
<li>uninstall mysql2 and install it again</li>
<li>uninstall mysql with apt-get</li>
<li>installd dev-tools from mysql</li>
<li>and almost all the pages on Google</li>
</ul>

How can I fix this?

gem install mysql2 fails

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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我发现了一个错误：sudo gem install mysql2Building native extensions.  This could take a while...ERROR:  Error installing mysql2:    ERROR: Failed to build gem native extension./usr/bin/ruby1.8 extconf.rbchecki

问gem安装mysql2失败
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