Add 6.38.00-rc1

Author: dpiparo

_releases/release-63800-rc1.md

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+---
+layout: releases
+version: 6.38.00-rc1
+release_date: 2025-11-05
+state:
+
+toc: true
+toc_sticky: true
+sidebar:
+  nav: "releases"
+---
+
+
+## Release Notes
+This release is an opportunity to try out the new functionalities of the 6.38.00 development release, currently scheduled by the end of November.
+The new ROOT comes with many new features (see the preliminary release notes) as well as improved stability: more than 240 items in the ROOT trackers have been addressed for this release.
+The release notes for this release can be found [here](https://root.cern/doc/v638/release-notes.html).
+
+## Binary distributions
+
+Instead of manually downloading this binary, please explore first whether your [package manager](../../install/#install-via-a-package-manager){:target="\_blank"} 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 |
+|-----------|-------|-----|
+| Almalinux 8.10 | [root_v6.38.00-rc1.Linux-almalinux8.10-x86_64-gcc8.5.tar.gz](https://root.cern/download/root_v6.38.00-rc1.Linux-almalinux8.10-x86_64-gcc8.5.tar.gz) | 289M |
+| Almalinux 9.6 | [root_v6.38.00-rc1.Linux-almalinux9.6-x86_64-gcc11.5.tar.gz](https://root.cern/download/root_v6.38.00-rc1.Linux-almalinux9.6-x86_64-gcc11.5.tar.gz) | 311M |
+| Almalinux 10.0 | [root_v6.38.00-rc1.Linux-almalinux10.0-x86_64-gcc14.2.tar.gz](https://root.cern/download/root_v6.38.00-rc1.Linux-almalinux10.0-x86_64-gcc14.2.tar.gz) | 319M |
+| Debian 13 | [root_v6.38.00-rc1.Linux-debian13-x86_64-gcc14.2.tar.gz](https://root.cern/download/root_v6.38.00-rc1.Linux-debian13-x86_64-gcc14.2.tar.gz) | 314M |
+| Fedora 42 | [root_v6.38.00-rc1.Linux-fedora42-x86_64-gcc15.2.tar.gz](https://root.cern/download/root_v6.38.00-rc1.Linux-fedora42-x86_64-gcc15.2.tar.gz) | 340M |
+| Fedora 43 | [root_v6.38.00-rc1.Linux-fedora43-x86_64-gcc15.2.tar.gz](https://root.cern/download/root_v6.38.00-rc1.Linux-fedora43-x86_64-gcc15.2.tar.gz) | 359M |
+| Ubuntu 22.04 | [root_v6.38.00-rc1.Linux-ubuntu22.04-x86_64-gcc11.4.tar.gz](https://root.cern/download/root_v6.38.00-rc1.Linux-ubuntu22.04-x86_64-gcc11.4.tar.gz) | 300M |
+| Ubuntu 24.04 | [root_v6.38.00-rc1.Linux-ubuntu24.04-x86_64-gcc13.3.tar.gz](https://root.cern/download/root_v6.38.00-rc1.Linux-ubuntu24.04-x86_64-gcc13.3.tar.gz) | 318M |
+| Ubuntu 25.04 | [root_v6.38.00-rc1.Linux-ubuntu25.04-x86_64-gcc14.2.tar.gz](https://root.cern/download/root_v6.38.00-rc1.Linux-ubuntu25.04-x86_64-gcc14.2.tar.gz) | 299M |
+| macOS 14.8 x86_64 Xcode 16 | [root_v6.38.00-rc1.macos-14.8-x86_64-clang160.pkg](https://root.cern/download/root_v6.38.00-rc1.macos-14.8-x86_64-clang160.pkg) | 475M |
+| macOS 14.8 x86_64 Xcode 16 | [root_v6.38.00-rc1.macos-14.8-x86_64-clang160.tar.gz](https://root.cern/download/root_v6.38.00-rc1.macos-14.8-x86_64-clang160.tar.gz) | 313M |
+| macOS 15.7 arm64 Xcode 17 | [root_v6.38.00-rc1.macos-15.7-arm64-clang170.pkg](https://root.cern/download/root_v6.38.00-rc1.macos-15.7-arm64-clang170.pkg) | 453M |
+| macOS 15.7 arm64 Xcode 17 | [root_v6.38.00-rc1.macos-15.7-arm64-clang170.tar.gz](https://root.cern/download/root_v6.38.00-rc1.macos-15.7-arm64-clang170.tar.gz) | 303M |
+| macOS 26.1 arm64 Xcode 17 | [root_v6.38.00-rc1.macos-26.1-arm64-clang170.pkg](https://root.cern/download/root_v6.38.00-rc1.macos-26.1-arm64-clang170.pkg) | 471M |
+| macOS 26.1 arm64 Xcode 17 | [root_v6.38.00-rc1.macos-26.1-arm64-clang170.tar.gz](https://root.cern/download/root_v6.38.00-rc1.macos-26.1-arm64-clang170.tar.gz) | 314M |
+| Windows Visual Studio 2022 32-bit x86 | [root_v6.38.00-rc1.win32.python311.vc17.exe](https://root.cern/download/root_v6.38.00-rc1.win32.python311.vc17.exe) | 130M |
+| Windows Visual Studio 2022 32-bit x86 (release with debugging information) | [root_v6.38.00-rc1.win32.python311.vc17.relwithdebinfo.exe](https://root.cern/download/root_v6.38.00-rc1.win32.python311.vc17.relwithdebinfo.exe) | 358M |
+| Windows Visual Studio 2022 32-bit x86 (release with debugging information) | [root_v6.38.00-rc1.win32.python311.vc17.relwithdebinfo.zip](https://root.cern/download/root_v6.38.00-rc1.win32.python311.vc17.relwithdebinfo.zip) | 565M |
+| Windows Visual Studio 2022 32-bit x86 | [root_v6.38.00-rc1.win32.python311.vc17.zip](https://root.cern/download/root_v6.38.00-rc1.win32.python311.vc17.zip) | 179M |
+| Windows Visual Studio 2022 64-bit x64 | [root_v6.38.00-rc1.win64.python311.vc17.exe](https://root.cern/download/root_v6.38.00-rc1.win64.python311.vc17.exe) | 135M |
+| Windows Visual Studio 2022 64-bit x64 (release with debugging information) | [root_v6.38.00-rc1.win64.python311.vc17.relwithdebinfo.exe](https://root.cern/download/root_v6.38.00-rc1.win64.python311.vc17.relwithdebinfo.exe) | 371M |
+| Windows Visual Studio 2022 64-bit x64 (release with debugging information) | [root_v6.38.00-rc1.win64.python311.vc17.relwithdebinfo.zip](https://root.cern/download/root_v6.38.00-rc1.win64.python311.vc17.relwithdebinfo.zip) | 586M |
+| Windows Visual Studio 2022 64-bit x64 | [root_v6.38.00-rc1.win64.python311.vc17.zip](https://root.cern/download/root_v6.38.00-rc1.win64.python311.vc17.zip) | 186M |
+
+## Source distribution
+
+| Platform       | Files | Size |
+|-----------|-------|-----|
+| source | [root_v6.38.00-rc1.source.tar.gz](https://root.cern/download/root_v6.38.00-rc1.source.tar.gz) | 369M |
+
+
+## Installations in CVMFS
+
+Standalone installations with minimal external dependencies are available at:
+~~~
+/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.38.00-rc1/arm64-mac157-clang170-opt
+/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.38.00-rc1/arm64-mac261-clang170-opt
+/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.38.00-rc1/x86_64-almalinux10.0-gcc142-opt
+/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.38.00-rc1/x86_64-almalinux8.10-gcc85-opt
+/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.38.00-rc1/x86_64-almalinux9.6-gcc115-opt
+/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.38.00-rc1/x86_64-debian13-gcc142-opt
+/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.38.00-rc1/x86_64-fedora42-gcc152-opt
+/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.38.00-rc1/x86_64-fedora43-gcc152-opt
+/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.38.00-rc1/x86_64-mac148-clang160-opt
+/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.38.00-rc1/x86_64-ubuntu22.04-gcc114-opt
+/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.38.00-rc1/x86_64-ubuntu24.04-gcc133-opt
+/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.38.00-rc1/x86_64-ubuntu25.04-gcc142-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 v6-38-00-rc1 v6-38-00-rc1
+~~~
+
+See [instructions to build from source](../../install/#build-from-source){:target="\_blank"}.
+
+## 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](https://www.7-zip.org). 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).