Errors Installing mysql2 gem via the Bundler
Solution 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
Solution 2
For Ubuntu have to install following. libmysqlclient-dev libmysqlclient16
Solution 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
Solution 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.
Solution 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.
T.J. Schuck
Updated on March 30, 2020Comments
-
T.J. Schuck about 4 years
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?