In Ant, how can I dynamically build a property that references a property file?

Question

I am using Input tasks to collect specific property values and I want to concatenate those into one property value that references my properties file.

I can generate

Answer 1

The props antlib provides support for this but as far as I know there's no binary release available yet so you have to build it from source.

An alternative approach would be to use a macrodef: