To build riak, Erlang OTP 22 or higher is required.
make rel will build a release which can be run via rel/riak/bin/riak start. Riak is primarily configured via rel/riak/etc/riak.conf
To make a package, install appropriate build tools for your operating system and run make package.
To create a local multi-node build environment use make devclean; make devrel.
To test Riak use Riak Test.
legacy documentation is still generally relevant.
Issues and PRs can be tracked via Riak Github or Riak KV Github.