I just tried to build from cvs sources and ran into a small problem.
The junit.jar lib needs to be added to the classpath in the build.bat
file:

set CLASSPATH=.\lib\junit.jar

Otherwise, ant complains that it cannot find the junit task:

BUILD FAILED
C:\sf\firebird\client-java\build\test.xml:22: Could not create task or
type of type: junit.

Regards,

Rob