I’ve just installed MySQL 5 from mysql-5.5.9-osx10.6-x86_64.dmg package, see MySQL download website or mirrors. This package installs MySQL in /usr/local/mysql (symlink to mysql-5.5.9-osx10.6-x86_64). When I wanted to install DataMapper MySQL driver, I ran into the following error: $ sudo gem install dm-mysql-adapter –no-rdoc –no-ri Fetching: data_objects-0.10.3.gem (100%) Fetching: do_mysql-0.10.3.gem (100%) Building native extensions.  This could take … →