Errors Installing mysql2 gem via the Bundler - mysql

Question

I am trying to install the mysql2 gem via the Bundler, but it keeps dying with the following error:
** 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-config parameter to fix it. So, based on:
$ which mysql_config
/usr/bin/mysql_config
I added the following to the Bundler's config:
$ bundle config build.mysql2 --with-mysql-config='/usr/bin/mysql_config'
However, still no luck -- same crash as above.
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.
$ find / -name mysql.h
/usr/include/mysql5/mysql/mysql.h
Any thoughts?

Answer 1

Answer was similar to the one Wrikken posted -- here's what I did to fix it for the sake of future readers.
(This is for RHEL 5.5 -- similar but different commands apply for Ubuntu/Debian/etc.)
Doing sudo yum list installed will print out all installed packages on your machine (note: yum on RHEL requires you add a Red Hat Network repository [I use EPEL], and run it via sudo).
I had mysql and 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 missing error and similar other build errors.
Long story short, after a mysqldump -u root -ppassword --all-databases > full-dump.sql for safety, it was fixed with a simple
sudo yum install mysql-devel

Answer 2

For Ubuntu have to install following.
libmysqlclient-dev
libmysqlclient16

Answer 3

For Mac with a brew install of mysql the following solution fixed the problem for me:
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.
This solved the problem with "gem install mysql2".
Reference: http://www.randomactsofsentience.com/2013/05/gem-install-mysql2-missing-mysqlh-on-os.html

Answer 4

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,
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.
In that case, you need to uninstall all the existing mysql2 packages and install it again.
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.
Then you can install the mysql-server and mysql-client.
yum install mysql-server
yum install mysql-client
Now you do the installation of mysql-devel package.
yum install mysql-devel
Now there is no package clashes and you can able to install the mysql2 gem.
gem install mysql2 -v '0.3.11'
Now your mysql2 gem will be successfully installed and you are good to go.

Answer 5

I got the same error. and for ubuntu 16. I had to write below command:
sudo apt-get install libmysqlclient-dev
and it work back.

Answer 6

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:
-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.
What worked for me was to hand edit the mysql_config file removing the reference to those options from the line:
cflags="-I$pkgincludedir -Os -w -pipe -march=native -Xclang -target-feature -Xclang -aes -Qunused-arguments -O2 -g -DDBUG_OFF " #note: end space!
which I rewrote as:
cflags="-I$pkgincludedir -Os -w -pipe -march=native -O2 -g -DDBUG_OFF " #note: end space!

Answer 7

I know this is ancient, but if anyone still gets this zlib error, make certain that you typed:
rvm use
(whatever version you're using)
I could have sworn I did that. Just posting in case anyone is pulling their hair out and this helps. If not good luck. :)

Answer 8

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

Answer 9

On my Ubuntu 16.04.4 LTS running mysql Ver 15.1 Distrib 10.0.34-MariaDB, for debian-linux-gnu (x86_64) using readline 5.2, the following worked:
sudo apt-get install libmariadb-client-lgpl-dev
I saw, that the error message of the current installer suggests running
apt-get install libmysqlclient-dev
This might work as well.