AntHX is a collection of Ant tasks for use with Haxe.
If you're not familiar with Ant you can start with its wiki page.

You can install AntHX using:
haxelib install anthx

A Java Development Kit (JDK) and Ant must also be installed.

Full documentation is available on the project's Google Code site here:
http://code.google.com/p/anthx/

Examples:

<haxe hxml="test.hxml"/>

<haxe2neko main="App" out="app.n"/>

<neko file="app.n"/>

<haxe2swf main="App" out="app.swf" version="9" swflib="resources.swf">
   <header width="100" height="100" framerate="25" background="FF0000"/>
   <lib name="handyXML"/>
   <classpath>
      <pathelement location="E:\src"/>
   </classpath>
</haxe2swf>

<getHaxelibPath lib="swhx" property="folder.haxelib"/>
<echo>SWHX installed at:${folder.haxelib}</echo>

<haxeEmbed><![CDATA[
neko.Lib.println("Some embedded Haxe code.");
]]></haxeEmbed>

See also the build file for AntHX itself.