JUnit and Apache Ant issues

Hi all

1. I have installed JUnit-4.8.1.

CLASSPATH is set as follows:
export CLASSPATH=/usr/share/junit-4.3.1/junit-4.3.1.jar:/usr/share/junit-4.3.1

Following regression tests fails:
java org.junit.runner.JUnitCore org.junit.tests.AllTests

Exception in thread "main" java.lang.NoClassDefFoundError: org/junit/runner/JUnitCore
Caused by: java.lang.ClassNotFoundException: org.junit.runner.JUnitCore
        at java.net.URLClassLoader$1.run(URLClassLoader.java:200)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
        at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:276)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:251)
        at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:319)

2. I have installed Apache Ant-1.7.1

Build fails:
./build.sh -Ddist.dir=/opt/ant-1.7.1 dist

BUILD FAILED
apache-ant-1.7.1/build.xml:1106: The following error occurred while executing this line:
apache-ant-1.7.1/build.xml:912: We cannot build the test jar unless JUnit is present, as JUnit is needed
to compile the test classes.