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Add build options for ROOT 6.38 and improve NixOS install instructions #1143

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Merged
guitargeek merged 2 commits into from
Apr 9, 2026
Merged

Add build options for ROOT 6.38 and improve NixOS install instructions #1143

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7d88424
Don't mention `nix-env` in ROOT installation instructions
guitargeek Aug 19, 2025
278c2d8
Raise minimum required CMake version to 3.20
guitargeek Apr 9, 2026
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13 changes: 8 additions & 5 deletions install/index.md
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Expand Up @@ -196,16 +196,19 @@ If you encounter any issues, feel free to report them to the [guix-science issue

### <a name="nixos_nix_nixpkgs" />NixOS/Nix/Nixpkgs

The package name for ROOT in nixpkgs is `root`. It can be installed into the user environment using
The package name for ROOT in nixpkgs is `root`.

You can start a temporary shell to try out ROOT as follows:
```sh
$ nix-env -f '<nixpkgs>' -iA root
$ nix-shell -p root
$ root
```

Running in a temporary environment can be achieved with

As explained in the [NixOS Wiki](https://nixos.wiki/wiki/Python), the preferred way to use Python is to add it to your environment along with any libraries you need.
NixOS also has a `python3.root` package for that, which you can add to a temporary Python environment in a Nix shell like this:
```sh
$ nix-shell -p root --run root
$ nix-shell -p "python3.withPackages (pkgs: with pkgs; [ root ])"
$ python -i -c "import ROOT"
```

A `root5` package is provided for the legacy software support.
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2 changes: 1 addition & 1 deletion manual/integrate_root_into_my_cmake_project/index.md
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Expand Up @@ -61,7 +61,7 @@ The following is an example of a project that creates a library and an executabl
# Otherwise, you must tell the build system where to look for ROOT,
# for example by passing `-DROOT_DIR="/path/to/root/installation` at CMake configuration time.

cmake_minimum_required(VERSION 3.0 FATAL_ERROR)
cmake_minimum_required(VERSION 3.20 FATAL_ERROR)
project(event)

# Locate the ROOT package and define a number of useful targets and variables.
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