Can't install mysql gem on Mac OS X

Question

I installed the MySQL server with the installer from http://dev.mysql.com/downloads/mysql. Then, as explained in several guides, I wanted to install the mysql gem with the f

Answer 1

The problem is explained here: http://www.randomactsofsentience.com/2013/05/gem-install-mysql2-missing-mysqlh-on-os.html. In short:

Change the file /usr/local/mysql/bin/mysql_config around line 120

cflags="-I$pkgincludedir  -Wall -Wno-null-conversion -Wno-unused-private-field -Os -g -fno-strict-aliasing -DDBUG_OFF -arch x86_64 " #note: end space!
cxxflags="-I$pkgincludedir  -Wall -Wno-null-conversion -Wno-unused-private-field -Os -g -fno-strict-aliasing -DDBUG_OFF -arch x86_64 " #note: end space!

to

cflags="-I$pkgincludedir  -Wall -Os -g -fno-strict-aliasing -DDBUG_OFF -arch x86_64 " #note: end space!
cxxflags="-I$pkgincludedir  -Wall -Os -g -fno-strict-aliasing -DDBUG_OFF -arch x86_64 " #note: end space!

Answer 2

I has problem when installing mysql2psql on Fedora 21 and I solve it by downloading mysql source tar.gz from mysql.org and set --with-mysql-config to this extracted directory to bin/mysql_config file

gem install mysql2psql -- --with-mysql-config=/pathtodownloadedsource/mysql../bin/mysql_config

Answer 3

The problem is not the gem itself. You are missing XCode (Install it from the AppStore) and possibly https://github.com/kennethreitz/osx-gcc-installer too as your error log says says:

You have to install development tools first.

For a better explanation of the problem, have a look at mkmf.log as the error log suggests as well.