To build from "edge" code - both Castle Project MonoRail and Asp.Net Mvc view engine
svn co http://dev.dejardin.org/svn/spark/trunk/ Spark cd Spark build
Assuming you're using a particular build of castle you would copy those assemblies onto over the ones which are a part of the project at bin/castle.
You can browse the source online at http://dev.dejardin.org/trac/spark/browser/trunk/src
Build output on 1-1-2009 Download zip - Download source
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For "edge" code - both Castle Project MonoRail and Asp.Net Mvc view engine
svn co http://dev.dejardin.org/svn/spark/trunk/ Spark cd Spark build
The spark view engine is also committed in the contribs repos of castle project. It won't be as current as the trunk here, but should always be in a usable state.
For Castle Project MonoRail view engine in contrib trunk
svn co http://svn.castleproject.org:8080/svn/castlecontrib/viewengines/spark/trunk Spark cd Spark build