Unable to find a javac compiler; com.sun.tools.javac.Main is not on the classpath. Perhaps JAVA_HOME does not point to the JDK
Can you check what is your JAVA_HOME environment variable is set with? It should have been set to the JDK and not its "bin" directory (as the HOME variable implies).
Also, you can have an environment variable called ANT_HOME and set it with the "home" directory where you have extracted "ant" in your drive.
Where? If I remember correctly, where you *need* to do it is in the Ant preferences inside Eclipse...
The soul is dyed the color of its thoughts. Think only on those things that are in line with your principles and can bear the light of day. The content of your character is your choice. Day by day, what you do is who you become. Your integrity is your destiny - it is the light that guides your way. - Heraclitus