As a quick n dirty patch to restore usage of log4j rather than commons-logging apply the following diff:
diff -w -b Category.java src/main/tyrex/util/logging/Category.java
53,55c53,54
<
< import org.apache.commons.logging.Log;
< import org.apache.commons.logging.LogFactory;
---
> // import org.apache.commons.logging.Log;
> // import org.apache.commons.logging.LogFactory;
67c66,67
