Spas, welcome to the Ranch!
The first error message says what the problem is:
Unable to load the JDBC driver org.apache.derby.jdbc.EmbeddedDriver
Please check your CLASSPATH.
java.lang.ClassNotFoundException: org.apache.derby.jdbc.EmbeddedDriver
You are missing the Apache Derby
JDBC driver in your classpath.
Looking at the Ant build file, you can see what it uses for the classpath:
It takes your home directory, and adds two JAR files named becker.jar and glos.jar that are in the directory that ${javalib} refers to. Looking a bit further (line 23 of build.xml), you can see that this directory is taken from where the environment variable CO.LIB points to.
You probably need to put the Apache Derby JAR file in the same directory as the other two JAR files, and then add a line after line 30 in build.xml with the name of the library, something like this: