In the following the main aspects are summarized for both after and before v6. The main feature introduced in v6. Also note that v6. For each Python version X. Moreover, for a given Python installation to be considered, it must provide both the Python interpreter binary and the development package.
PyROOT can be built with only one version of Python even if multiple installations are present in the system. Therefore, once the ROOT environment has been set e. In this case the Python version used to build will be by default the one pointed by the executable python. Generally speaking, newer standards are only supported by newer ROOT versions. The backports can be found here in the reference guide. Starting with ROOT 6. There are two main methods of installing ROOT from source: location independent and fixed location.
The former is advised for a personal installation of ROOT, while the latter for a system-wide installation. The mode of installation is controlled via the gnuinstall option during configuration. This is the configuration used by the binary releases on the website. The installation can be done by running. The fixed location installation method does not require setting any environment variables when ROOT is installed into default system paths e.
Please note that some of the options might be turned OFF automatically for some platforms or if the required external library or component can not be satisfied. The user can view and edit the full list of options using the ccmake utility or cmake-gui for Windows. Note that on Windows some of the options are not yet implemented. The user can set any CMake variable or option that controls the build process from the cmake command line. Note : Some options have platform-dependent default values e.
Click on one of the following dropdowns to see the full list of build options for a specific ROOT release:. The list of externals depends on the build options that have been enabled. CMake will look for these third party products at a number of standard places in your system but the user can influence the search by setting some environment variables before invoking the CMake command or by setting package specific CMake variables to their exact location.
The actual cached values used by CMake for the exact location of libraries and include files of the used external libraries can be inspected and modified using the ccmake utility.
The latest stable ROOT release is 6. There are several ways to install ROOT on your computer: they are all listed in the table of content on the right. Which one is best for you depends on your operating system and usage requirements. In all cases, make sure to always use the most recent ROOT release possible to get the latest bug fixes, features and quick user support. The steps to install a pre-compiled binary are simple:. To avoid having to source thisroot. Note, however, that sourcing thisroot.
Then you can start ROOT:. Supported by the community: these packages are not maintained by the ROOT team, but by helpful members of the community. If you package ROOT and would like to be added to the list below, please contact us by clicking the letter icon at the bottom of the page. To create a new conda environment containing ROOT and activate it, execute. More instructions about using this package are available in this blog post.
Please report any issues with the conda package here. More typically, however, users will want more than just the base package. To install ROOT with support for python and notebooks, for example, run. It can be installed with. The package name for ROOT in nixpkgs is root.
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