The document was written to build Incus v0.3.0. You may need a different how-to if you want to build higher versions of Incus.
- Incus v0.3.0 (via release tarball)
- AlpineLinux 3.18 x86_64
This how-to document will help you to build Incus for AlpineLinux. Original reference is here: https://linuxcontainers.org/incus/docs/main/installing/#from-source-build-a-release