Bruce posted a message that there is now also a Squeak port of "Sport" available at the sourceforge.net project site (contributed by Janko).
If you want to get the latest version for Squeak you can use the Squeaksource page:
Sport is a Smalltalk portability layer. Sport presents a consistent interface and implemented in a number of Smalltalk dialects. Smalltalk code written to the Sport interfaces can be run in any Smalltalk dialect without alteration.