Release 6.42.00-rc1 - 2026-10-29
Release Notes
The release notes for this release can be found here.
Binary distributions
Instead of manually downloading this binary, please explore first whether your package manager already provides this version. This way, you will automatically keep up-to-date with the latest stable versions with no manual maintenance on your side.
Important note about macOS 27 binaries
The binaries have been built after installing all ROOT dependencies with brew. If you intend to use ROOT on macOS 27, please install the ROOT dependencies with the command brew install --only-dependencies root.
Source distribution
| Platform | Files | Size |
|---|---|---|
| source | root_v6.42.00-rc1.source.tar.gz | 351M |
Installations in CVMFS
Standalone installations with minimal external dependencies are available at:
/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.42.00-rc1/arm64-mac266-clang210-opt
/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.42.00-rc1/arm64-mac270-clang210-opt
/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.42.00-rc1/x86_64-almalinux10.2-gcc143-opt
/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.42.00-rc1/x86_64-almalinux8.10-gcc85-opt
/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.42.00-rc1/x86_64-almalinux9.8-gcc115-opt
/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.42.00-rc1/x86_64-debian13-gcc142-opt
/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.42.00-rc1/x86_64-fedora43-gcc153-opt
/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.42.00-rc1/x86_64-fedora44-gcc162-opt
/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.42.00-rc1/x86_64-mac158-clang170-opt
/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.42.00-rc1/x86_64-ubuntu22.04-gcc114-opt
/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.42.00-rc1/x86_64-ubuntu24.04-gcc133-opt
/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.42.00-rc1/x86_64-ubuntu26.04-gcc152-opt
/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.42.00-rc1/x86_64-ubuntu26.10-gcc153-opt
Git
The entire ROOT source can be obtained from our public Git repository:
git clone https://github.com/root-project/root.git
The release specific tag can be obtained using:
cd root
git checkout -b v6-42-00-rc1 v6-42-00-rc1
See instructions to build from source.
Windows
Windows 10/7/… are supported. We offer two packaging types:
- exe: a regular Windows installer package also setting up the required environment variables. With uninstall via “Control Panel” / “Add or Remove Programs”. Simply download and start. You can double-click ROOT to run it; ROOT files get registered with Windows.
- tar: unpack e.g. with 7zip. Start ROOT in a Microsoft Visual Studio Prompt (in Start / Programs / Microsoft Visual Studio / Tools). If you installed ROOT to
C:\rootthen callC:\root\bin\thisroot.batbefore using ROOT to set up required environment variables. Call insteadthisroot.ps1if you run from apowershell(the default terminal in Visual Studio Code).
Important installation notes
- You must download the binary built with the exact same version of Visual Studio (and Python) than the one installed on your system.
- Don’t forget to select the component “Desktop development with C++” when running the Visual Studio Installer.
- Do not untar in a directory with a name containing blank characters.
- Take the release version if performance matters.
- If you want to debug your code you need the ROOT debug build (you cannot mix release / debug builds due to a Microsoft restriction).