Errors Installing mysql2 gem via the Bundler

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/rub         


        

Answer 1

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 2

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 3

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 4

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 5

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 6

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.