This page describes how to build JMeter.
Obtaining the code
The code can either be obtained from SVN, or extracted from the release archives.
Download code from SVN
svn co http://svn.apache.org/repos/asf/jmeter/trunk target-directory
Extract code from release archives
Unpack both the binary and source archives for the same release into the same directory structure.
There should be a couple of duplicate files: LICENCE, NOTICE
Building the code using Ant
Change to the top-level JMeter directory - the one containing build.properties and build.xml
Run the following command:
ant package
This will compile all the classes and create all the jars.
Building the code using Eclipse
See eclipse.readme in the distribution