Release 6.26.20 - 2026-06-10

Release Notes

This is the final patch for the 6.26 release series, as per ROOT’s release and support plan.

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.

Platform Files Size
root_v6.26.20.Linux-AlmaLinux8.10x86_64-gcc8.5.tar.gz root_v6.26.20.Linux-AlmaLinux8.10x86_64-gcc8.5.tar.gz 235M
root_v6.26.20.Linux-AlmaLinux9.8x86_64-gcc11.5.tar.gz root_v6.26.20.Linux-AlmaLinux9.8x86_64-gcc11.5.tar.gz 250M
Ubuntu 22 root_v6.26.20.Linux-ubuntu22-x86_64-gcc11.4.tar.gz 250M

Source distribution

Platform Files Size
source root_v6.26.20.source.tar.gz 186M

Installations in CVMFS

Standalone installations with minimal external dependencies are available at:

/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.26.20/almalinux8.10x86_64-gcc85-opt
/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.26.20/almalinux9.8x86_64-gcc115-opt
/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.26.20/x86_64-ubuntu22-gcc114-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 v6-26-20 v6-26-20

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:\root then call C:\root\bin\thisroot.bat before using ROOT to set up required environment variables. Call instead thisroot.ps1 if you run from a powershell (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).