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
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:
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:
- RVM now honors (again) the configure flags passed in on the command line -C –enable-shared,–with-iconv-dir=...
- RVM now specifies both --host and --build configure flags on OSX in order to ensure that it will properly build as x86_64 or i386.
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