This page describes how to build JMeter.
Obtaining the code
The code can either be obtained from GIt, or extracted from the release archives.
Download code from Git
git clone https://github.com/apache/jmeter.git 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 download_jars ant package
This will compile all the classes and create all the jars.
Building the code using Eclipse
See eclipse.md in the distribution