On Aug 28, 1999 I noticed that the class files in this directory must be compiled in a certain order. This turns out (I think) to be due to the version of Java being used -- I'm now using the one distributed with RedHat Linux 6.0 -- This appears to be part of the package "kaffe" - a free implementation of the Java virtual machine. The order the class files must be compiled in is: Matrix3x3.class Vertex.class Primitive.class Slate.class