Build failure - javacc

[Edward Rayl]

I've downloaded the distribution and followed the instructions including 
downloading the javacc-3.1version of the javacc.jar file and putting in 
the directory  ${derby.source}/tools/java.  When I run ant, I get:

genParser:
    [echo]   Generating ij parser...
    [java] java.lang.NoClassDefFoundError: javacc
    [java] Exception in thread "main"
Was this jar really supposed to located somewhere else, does build.xml 
need some attention, or have I screwed up?

Ed