Installing Ruby's MySQL Gem With MySQL Installed Via Fink

If you've installed MySQL via fink and you're going to install the MySQL gem for Ruby and you're getting something like this:

Macintosh:~ brianpuccio$ sudo gem install mysql
Building native extensions.  This could take a while...
ERROR:  Error installing mysql:
	ERROR: Failed to build gem native extension.

/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/bin/ruby extconf.rb install mysql -- --with-mysql-dir=/sw/var/mysql/
checking for mysql_query() in -lmysqlclient... no
checking for main() in -lm... yes
checking for mysql_query() in -lmysqlclient... no
checking for main() in -lz... yes
checking for mysql_query() in -lmysqlclient... no
checking for main() in -lsocket... no
checking for mysql_query() in -lmysqlclient... no
checking for main() in -lnsl... no
checking for mysql_query() in -lmysqlclient... no
*** 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.

The command you really need is sudo gem install mysql -- --with-mysql-config=/opt/local/lib/mysql5/bin/mysql_config