Alas, the sources require Bazel to build. That's going to limit adoption because Bazel is difficult to deal with and most projects don't use it.
2. Download a bazel binary (https://github.com/bazelbuild/bazel/releases or use package manager)
3. bazel build -c opt :encoder_main
4. bazel-bin/encoder_main --input_path=testdata/sample1_16kHz.wav --output_dir=$HOME/temp --bitrate=3200
Done!