MySQL 通过 Bundler 安装 mysql2 gem 时出错

Errors Installing mysql2 gem via the Bundler

提问by T.J. Schuck

I am trying to install the mysql2gem via the Bundler, but it keeps dying with the following error:

我正在尝试mysql2通过 Bundler安装gem，但它一直因以下错误而死亡：

** executing command
/home/cc_rails/.rvm/rubies/ruby-1.9.2-p0/lib/ruby/1.9.1/rubygems/installer.rb:483:in 'rescue in block in build_extensions': 
ERROR: Failed to build gem native extension. (Gem::Installer::ExtensionBuildError)

/home/cc_rails/.rvm/rubies/ruby-1.9.2-p0/bin/ruby extconf.rb --with-mysql-config=/usr/bin/mysql_config
checking for rb_thread_blocking_region()... 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
--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=/home/cc_rails/.rvm/rubies/ruby-1.9.2-p0/bin/ruby
--with-mysql-config
Gem files will remain installed for inspection.

Most things I found via Googling recommended passing the --with-mysql-configparameter to fix it. So, based on:

我通过谷歌搜索发现的大多数东西都建议传递--with-mysql-config参数来修复它。所以，基于：

$ which mysql_config
/usr/bin/mysql_config

I added the following to the Bundler's config:

我在 Bundler 的配置中添加了以下内容：

$ bundle config build.mysql2 --with-mysql-config='/usr/bin/mysql_config'

However, still no luck -- same crash as above.

但是，仍然没有运气 - 与上述相同的崩溃。

Since it's dying with the error mysql.h is missing, I checked for that, and it's allegedly around, just can't be found by the Bundler.

由于它因错误而死亡mysql.h is missing，我检查了它，据称它在附近，只是 Bundler 找不到。

$ find / -name mysql.h
/usr/include/mysql5/mysql/mysql.h

Any thoughts?

有什么想法吗？

回答by T.J. Schuck

Answer was similar to the one Wrikken posted -- here's what I did to fix it for the sake of future readers.

答案与 Wrikken 发布的类似——这是我为了未来的读者而修复它的方法。

(This is for RHEL 5.5 -- similar but different commands apply for Ubuntu/Debian/etc.)

（这是针对 RHEL 5.5 - 类似但不同的命令适用于 Ubuntu/Debian/等。）

Doing sudo yum list installedwill print out all installed packages on your machine (note: yumon RHEL requires you add a Red Hat Network repository [I use EPEL], and run it via sudo).

这样做sudo yum list installed会打印出您机器上所有已安装的软件包（注意：yum在 RHEL 上需要您添加一个 Red Hat Network 存储库 [我使用EPEL]，并通过 运行它sudo）。

I had mysqland mysql-server, which explained why MySQL worked fine for every pre-existing app, but no mysql-devel, which is necessary to fix that mysql.h is missingerror and similar other build errors.

我有mysql和mysql-server，这解释了为什么 MySQL 对每个预先存在的应用程序都能正常工作，但没有mysql-devel，这是修复该mysql.h is missing错误和其他类似构建错误所必需的。

Long story short, after a mysqldump -u root -ppassword --all-databases > full-dump.sqlfor safety, it was fixed with a simple

长话短说，mysqldump -u root -ppassword --all-databases > full-dump.sql为了安全起见，它用一个简单的方法固定

sudo yum install mysql-devel

回答by Indika K

For Ubuntu have to install following. libmysqlclient-dev libmysqlclient16

对于 Ubuntu 必须安装以下。libmysqlclient-dev libmysqlclient16

回答by guido

For Mac with a brew install of mysql the following solution fixed the problem for me:

对于使用 brew 安装 mysql 的 Mac，以下解决方案为我解决了这个问题：

I edited the mysql_config file in /usr/local/Cellar/mysql/5.6.12/bin and removed the W-compiler options -Wno-null-conversion and -Wno-unused-private-field for cflags and cxxflags.

我编辑了 /usr/local/Cellar/mysql/5.6.12/bin 中的 mysql_config 文件，并删除了 cflags 和 cxxflags 的 W 编译器选项 -Wno-null-conversion 和 -Wno-unused-private-field。

This solved the problem with "gem install mysql2".

这解决了“gem install mysql2”的问题。

Reference: http://www.randomactsofsentience.com/2013/05/gem-install-mysql2-missing-mysqlh-on-os.html

参考：http: //www.randomactsofsentience.com/2013/05/gem-install-mysql2-missing-mysqlh-on-os.html

回答by maniempire

The above problem will be occured because the mysql-devel package is not properly installed in your system. I will be explain the same in Centos of how to fix it. When you try to install that package using,

出现上述问题是因为你的系统没有正确安装mysql-devel包。我将在 Centos 中解释如何修复它。当您尝试使用安装该软件包时，

    yum install mysql-devel

somtimes there will be some clash occurs with the existing packages that gets installed if you install the MySql-Administrative tool and MySQL query browser.

如果您安装 MySql-Administrative 工具和 MySQL 查询浏览器，有时会与安装的现有包发生一些冲突。

In that case, you need to uninstall all the existing mysql2 packages and install it again.

在这种情况下，您需要卸载所有现有的 mysql2 包并重新安装。

    rpm -qa -last | grep -i mysql
    yum remove MySQL-server-5.5.27-1.rhel5
    yum remove MySQL-client-5.5.27-1.rhel5
    yum remove mysql-gui-tools-5.0r12-1rhel4
    yum remove mysql-query-browser-5.0r12-1rhel4-a

So, you can uninstall whatever mysql things displayed with rpm -qa as like above.

因此，您可以像上面一样卸载使用 rpm -qa 显示的任何 mysql 内容。

Then you can install the mysql-server and mysql-client.

然后你可以安装 mysql-server 和 mysql-client。

    yum install mysql-server
    yum install mysql-client

Now you do the installation of mysql-devel package.

现在你安装 mysql-devel 包。

    yum install mysql-devel

Now there is no package clashes and you can able to install the mysql2 gem.

现在没有包冲突，您可以安装 mysql2 gem。

    gem install mysql2 -v '0.3.11'

Now your mysql2 gem will be successfully installed and you are good to go.

现在您的 mysql2 gem 将成功安装，您可以开始使用了。

回答by user2449437

In my case the problem was a misbehaving mysql_config script. When invoked by the command line with the --cflags option it would return a string of options containing:

在我的情况下，问题是行为不当的 mysql_config 脚本。当由带有 --cflags 选项的命令行调用时，它将返回一个包含以下内容的选项字符串：

-Xclang -target-feature -Xclang -aes -Qunused-arguments

For some reason the call to have_header('mysql.h') in the extconf.rb script would fail if those option were included.

出于某种原因，如果包含这些选项，则在 extconf.rb 脚本中对 have_header('mysql.h') 的调用将失败。

What worked for me was to hand edit the mysql_config file removing the reference to those options from the line:

对我有用的是手动编辑 mysql_config 文件，从行中删除对这些选项的引用：

cflags="-I$pkgincludedir -Os -w -pipe -march=native -Xclang -target-feature -Xclang -aes -Qunused-arguments  -O2 -g -DDBUG_OFF " #note: end space!

which I rewrote as:

我改写为：

cflags="-I$pkgincludedir -Os -w -pipe -march=native  -O2 -g -DDBUG_OFF " #note: end space!

回答by Manish Shrivastava

I got the same error. and for ubuntu 16. I had to write below command:

我得到了同样的错误。对于 ubuntu 16。我必须写下面的命令：

sudo apt-get install libmysqlclient-dev 

and it work back.

它可以恢复。

回答by Matthias Luh

On my Ubuntu 16.04.4 LTSrunning mysql Ver 15.1 Distrib 10.0.34-MariaDB, for debian-linux-gnu (x86_64) using readline 5.2, the following worked:

在我的Ubuntu 16.04.4 LTS 上运行mysql Ver 15.1 Distrib 10.0.34-MariaDB，对于 debian-linux-gnu (x86_64) 使用 readline 5.2，以下工作：

sudo apt-get install libmariadb-client-lgpl-dev

I saw, that the error message of the current installer suggests running

我看到，当前安装程序的错误消息建议运行

apt-get install libmysqlclient-dev

This might work as well.

这也可能有效。

回答by zillaofthegods

I ran into this issue while bundle installing for redmine on fedora 23. The solution I found was to issue this command - sudo dnf install redhat-rpm-config.

我在 Fedora 23 上为 redmine 捆绑安装时遇到了这个问题。我找到的解决方案是发出这个命令 - sudo dnf install redhat-rpm-config.

Not only did this fix my issue with installing mysql2, but also for nokogiri and redcarpet.

这不仅解决了我安装 mysql2 的问题，还解决了 nokogiri 和 redcarpet 的问题。

回答by Kevin

I know this is ancient, but if anyone still gets this zlib error, make certain that you typed: rvm use

我知道这很古老，但是如果有人仍然遇到此 zlib 错误，请确保您输入：rvm use

(whatever version you're using)

（无论您使用的是什么版本）

I could have sworn I did that. Just posting in case anyone is pulling their hair out and this helps. If not good luck. :)

我可以发誓我做到了。只是张贴以防万一有人把头发拉出来，这会有所帮助。如果运气不好。:)