1. ruby has become 1.87
2. You must first install the new xcode on the CD, which is in the "optional" directory.
3. You may need to reinstall macport.
Http://trac.macports.org/wiki/Migration
4. or upgrade macport
Http://weblog.rubyonrails.org/2009/8/30/upgrading-to-snow-leopard
$ sudo port selfupdate
$ sudo port sync
$ sudo port upgrade --force installed
5. reinstall ruby and gem
Http://weblog.rubyonrails.org/2009/8/30/upgrading-to-snow-leopard
5. reinstall ferret
Http://purplellamas.net/blog/2009/09/14/snow-leopard-migration-issues/
In fact, it is just uninstall and then install
6. reinstall mysql and mysql gem
Http://weblog.rubyonrails.org/2009/8/30/upgrading-to-snow-leopard
Note that you must reinstall mysql server and then install mysql gem
$ sudo env ARCHFLAGS="-arch x86_64" gem install mysql -- --with-mysql-config=/usr/local/mysql/bin/mysql_config
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