Ant ???

Help !
  I am trying to move from DB2 to Postgresql but....
Under Db2  ,  Linux and OS/2 and Windows I use VisualAge Java 3.0 ...
VAJ includes a jdk of its own... Now it seems I will also have to add
JDK 118 also
have ANT to compile Postgresql..
  What is Ant ?? I cannot find refrence to it in my SUN Manual , other
Jave books,
the IBM Devleopers site or Posgres Doc.. Except to say I must have it..
 And oh yeah the Compiler error message.. Maybe I am not looking hard
enough..

What is it and where can I get it??
And can I still use VAJ 3.0 after compile and install.

Thanks very much

Bob T.