Downloads

Releases of the build3 build system, newest first.

Each tarball is a complete build system: the top makefile, a description of every component, and the target descriptions it ships with. It carries no sources — the build fetches those and checks them against the sums it records. The installation page describes how to use one.

VersionDescription
2026.10e The latest. All known bugs are fixed.
2026.10 Perlmutter target added.
2026.09 Wombat and engaging targeted.

Unless you need to reproduce an older build, take the newest. A build system and the component versions it pins go together; mixing one release's targets with another's part files is not supported.