Rebar3 is written in Erlang, so you need Erlang to run it. It is available as a binary that you can download and run. Just fetch the nightly build and give it execution permissions:
$ wget https://s3.amazonaws.com/rebar3/rebar3 && chmod +x rebar3
Place this binary in a convenient place and add it to your path. For example, in a bin directory in your home:
$ mkdir ~/bin && mv rebar3 ~/bin $ export PATH=~/bin:$PATH
This last line should be put in your
.bashrc. As an alternative, one can also link the binary to
/usr/local/bin directory, making it available as a normal command.
$ sudo ln -s /path/to/your/rebar3 /usr/local/bin