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PostgreSQL

Ensure that pg_config is in your path and the pg gem should install with no issues.

Alternatively you can specify the location to the pg_config via the CLI:

gem install pg -- --with-pg-config=/usr/local/postgresql/bin/pg_config

MySQL

Linux

Ensure that mysql_config is in your path and the mysql gem should install with no issues.

Alternatively you can specify the location to the mysql_config via the CLI:

gem install mysql -- --with-mysql-config=/usr/local/mysql/bin/mysql_config

Mac OS X

The architecture of mysql must match the selected ruby’s architecture so you might have to re-install/compile one of them to the desired arch.

You can find out the architecture of each by inspecting the output of:

file $(which mysql)
file $(which ruby)

It is recommended that you install MySQL via the pre-built pkg installer provided on dev.mysql.com in the downloads section. If you are running OSX 10.5 or later be sure to download the .pkg installer for 'x86_64' only, not the universal one nor the i386 one.

Once you have the architecture of both matching you can install the gem.

Place the following in your ~/.rvmrc file:

rvm_archflags="-arch x86_64"

Then install the mysql gem:

ARCHFLAGS="-arch x86_64" gem install mysql -- --with-mysql-config=/usr/local/mysql/bin/mysql_config

where in this example '/usr/local/mysql/bin/' is the path to my 'mysql_config' file installed with the .pkg mysql installer from dev.mysql.com.

Also be aware that there were just two bugfixes in building rubies:

Fixing Virtual Timer Errors

If you are encountering a virtual timer errors such as 'Virtual Timer Expired', please try installing an older version of the mysql gem. e.g:

gem uninstall mysql
gem install mysql --version 2.7