Release 5.21/04 - 2008-10-02

Source distribution

Platform Files Size
source root_v5.21.04.source.tar.gz 25M

Binary distributions

Platform Files Size
Linux.slc4.gcc3.4 root_v5.21.04.Linux.slc4.gcc3.4.tar.gz 47M
Linux.slc4_amd64.gcc3.4 root_v5.21.04.Linux.slc4_amd64.gcc3.4.tar.gz 49M
macosx i386 icc 9.1 root_v5.21.04.macosx-i386-icc-9.1.tar.gz 48M
macosx powerpc gcc 4.0 root_v5.21.04.macosx-powerpc-gcc-4.0.tar.gz 45M
macosx104 i386 gcc 4.0 root_v5.21.04.macosx104-i386-gcc-4.0.tar.gz 44M
macosx105 i386 gcc 4.0 root_v5.21.04.macosx105-i386-gcc-4.0.tar.gz 36M
SunOS.5.9 root_v5.21.04.SunOS.5.9.tar.gz 51M
win32 (dbg) root_v5.21.04.win32.debug.tar.gz 86M
win32 root_v5.21.04.win32.tar.gz 45M
Windows Visual Studio 90 (dbg) root_v5.21.04.win32.vc90.debug.tar.gz 104M
Windows Visual Studio 90 root_v5.21.04.win32.vc90.tar.gz 46M
win32gcc gcc 3.4 root_v5.21.04.win32gcc-gcc-3.4.tar.gz 48M


The entire ROOT source can be obtained from our public Git repository:

git clone

The release specific tag can be obtained using:

cd root
git checkout -b v5-21-04 v5-21-04


Windows 7/Vista/XP/NT/2000 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, or open directly. You can double-click ROOT to start it, ROOT files get registered with Windows.
  • tar: the traditional variant. 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.

Important installation notes

  • You must download the binary built with the exact same version of Visual Studio than the one installed on your system.
  • 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).