Make sure that you have make, git, wget, tar, gcc and sudo is installed. Further, you have to install go for Reva and Phoenix and yarn for Phoenix.
Check https://golang.org/dl/ for the latest version of go. Install it and make sure that go is in your $PATH.
For CentOS8, you can do this by:
curl --silent --location https://dl.yarnpkg.com/rpm/yarn.repo | sudo tee /etc/yum.repos.d/yarn.repo dnf install yarn -y
There is a dependency on nodejs 10 when building Phoenix. Make sure that that is installed.
Install Reva following the official documentation: Install Reva.
ownCloud Phoenix is not a required component for the IOP however is a nice add-on as it allows to interact with the IOP from a nice UI. To install Phoenix from the sources do:
git clone https://github.com/owncloud/phoenix cd phoenix git checkout v0.4.0 yarn install-all yarn dist
If you want to configure Reva to run locally with Phoenix you can follow this tutorial: https://reva.link/docs/tutorials/phoenix-tutorial/