'Can't built Jitsi with Ant

I am trying to follow these instructions In order to setup a working environment in Eclipse with the Jitsi project. When I am using Ant to rebuild the project I am getting errors, like if the code was incorrectly written, which obviously cannot be since I currently have the latest stable version checked out.

For example, one of the errors I get when I run the "rebuilt" target is: jitsi\src\net\java\sip\communicator\util\NetworkUtils.java:543: error: reference to Record is ambiguous

How could it be? When I check that file, Eclipse is not accusing any code error. There are also no Errors in the "Markers" tab. I must be failing in some obvious step, although I can't understand what is wrong..



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