Update README.md

Esri · Apr 1, 2013 · 89c91d5 · 89c91d5
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@@ -16,6 +16,7 @@ The Esri Geometry API for Java can be used to enable spatial data processing in
 ## Requirements
 
 * Java JDK 1.6 or greater.
+* [Apache Ant](http://ant.apache.org/) build system.
 * Experience developing MapReduce applications for [Apache Hadoop](http://hadoop.apache.org/).
 * Familiarity with text-based spatial data formats such as JSON or WKT would be useful.