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Installation on macOS system

There are several ways to perform software installation on macOS:

  • from dmg files
  • using package managers:
    • brew [used as example here]
    • port
    • fink
  • downloading and compiling sources two main ways to perform installation which depends on the linux package manager.

We propose here an example of installation procedure. If you are used to different methods, feel free to change the procedure. But anyway, make sure that your environment is ready to work by launching the tests at the end of the installation.

Step 0: Installing brew [optional but advised]

Whithin a terminal, launch the command: 

ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"

Note that it may take some time. Be patient. In order to check that brew is installed and obtained the version (2.7.5), type:

brew --version

Step 1: Installing the classical packages related to software development

1.1. Xcode

In principe, to develop in C++ you need at least a text editor and a C++ compiler such as g++. In principle, g++ is already available on macOS.
You can test can this is the case by typing into a terminal
g++ --version

Xcode is a developper environment under macOS that can be used. If it is not yet installed (check on Applications), you can download and install it using the link https://developer.apple.com/download/
Once Xcode is installed, you should normally access to:

  • C++ compiler: g++ (already installed by default) and clang
  • A program editor

Other options to install Xcode:

  • Using Apple Store
  • Launching the command (in a terminal): xcode-select --install

1.2. Installing Doxygen

1.3. Installing Git

  • Check if git is already installed
    In principle, git should be available once Xcode has been installed. You can test by launching the following command in a terminal
    git --version
    If it fails, you need to install git.
  • git installation: Instructions can be found here: https://git-scm.com/download/mac.
    If brew has been installed (cf section XX), you can type in a terminal:
    brew install git

Step 2: Installing the ROOT package

There are several ways to install ROOT including:

  • downloading and compiling the sources
    The pros are to choose the list of libraries compiled and to make sure that you are compliant with our environment. The cons are that it may appear as more complex and anyway time consumming.
  • using a pre-compiled version
    We suggest this solution for Ubuntu distributions.
  • using a package manager
    This is the simplest way to proceed.

Note that if ROOT is already installed on our machine and even if it is an old version, you don't need to update it to the latest one as we will only uses the basics of ROOT functionnalities.

Instructions on the website can found using this link https://root.cern/install/.

Ordered list of possibilities to install ROOT:

  • If brew has been installed [adviced], type into our terminal:
    brew install root
  • If instead you have macports installed, type:
    sudo port install root6
  • If none of this option is possible, download and install the binaries which correspond to you macOS version and our XCode version from the link: https://root.cern/releases/release-62206/. You should firstly make sure that XCode was installed.
  • Last solution is to ** buid from source**. This requires to that Cmake has been installed).
    Instructions can be found here: https://root.cern/install/#build-from-source