boosting based on number of terms matched?

I'm using the edismax handler, although my question is probably the same for dismax. When the user types a long query, I use the "mm" parameter so that only 75% of terms need to match. This works fine, however, sometimes documents that only match 75% of the terms show up higher in my results

Problem building Nightly Solr

I'd like to try the new edismax feature in Solr, so I downloaded the latest nightly (apache-solr-4.0-2010-07-05_08-06-42) and tried running "ant example". It fails with a missing package error. I've pasted in the output below. I tried a nightly from a couple weeks ago, and it did the same t