I tried:

<-- clip starts -->
[root]# gem install mysql -- --with-mysql-config=/usr/bin/mysql_config
Building native extensions.  This could take a while...
ERROR:  Error installing mysql:
        ERROR: Failed to build gem native extension.

/usr/local/bin/ruby extconf.rb install mysql -- 
--with-mysql-config=/usr/bin/mysql_config
checking for mysql_ssl_set()... no
checking for mysql.h... no
checking for mysql/mysql.h... 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.

Provided configuration options:
        --with-opt-dir
        --without-opt-dir
        --with-opt-include
        --without-opt-include=${opt-dir}/include
        --with-opt-lib
        --without-opt-lib=${opt-dir}/lib
        --with-make-prog
        --without-make-prog
        --srcdir=.
        --curdir
        --ruby=/usr/local/bin/ruby
        --with-mysql-config


Gem files will remain installed in 
/usr/local/lib/ruby/gems/1.8/gems/mysql-2.7 for inspection.
Results logged to 
/usr/local/lib/ruby/gems/1.8/gems/mysql-2.7/gem_make.out
<-- clip ends -->

Steps I needed on CentOS 5 linux were (in addition to installed 'normal' 
mysql)
1. Install mysql-devel "yum install mysql-devel" as root
2. Find the location of mysql_config "locate mysql_config" and fix that 
full path to "--with-mysql-config=" option
3. Success!

<-- clip starts -->
[root]# gem install mysql -- 
--with-mysql-config=/usr/lib/mysql/mysql_config
Building native extensions.  This could take a while...
Successfully installed mysql-2.7
1 gem installed
<-- clip ends -->
-- 
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