• Install the Java JDK or JRE packages you can find it at: http://java.sun.com/javase/downloads/index.jsp
• Install Apache Ant you can find it at: http://ant.apache.org/
• Add Apache Ant to your systems path environment variable, this is not required but makes it easier to issue commands to Ant without having to type the full path for it.

In the root directory of TinyMCE where the build.xml file is you can run ant against different targets.

ant

Will combine, preprocess and minify the TinyMCE plugin file.

ant release

Will produce an release package of the current repository code. The release packages will be placed in the tmp directory.

You can read more about how to contribute to this project at http://tinymce.moxiecode.com/contributing