Once you have everything configured, building and testing Cairngorm is easy and fast — it takes only a few minutes.
We need to update this once we get the code into SVN - do we want to replicate the Flex SDK structure, with ant scripts in the trunk and each branch, so people can decide what they want to build
See the Flex SDK Build and Test page: http://opensource.adobe.com/wiki/display/flexsdk/Build+and+Test