Parts of Nakai rely on code generation so that we don't have to write and update hundreds of identical functions by hand. The Gleam compiler does not provide a way for us to generate this code automatically when running things like gleam build, or gleam test. Instead, you should run make, make test, etc.
While Nakai itself is pure Gleam, and has no dependencies, the benchmarks require having Elixir installed, and building it requires that you have Rebar3 installed.