Install ROOT

Use this procedure when you wish to install ROOT as a standalone analysis tool for examining
Level 1 data.

Prerequisites

• GLAST_EXT environment variable must be set up to point at the directory set up to contain the GLAST external libraries.

Caution: A specific version of any release of Glast software uses a specific version of ROOT; any and all documentation assumes that the appropriate version of ROOT is being used.

For version numbers used with a specific release of Glast software, see Glast Package and External Library Content.

Procedure

To use the installer to determine (and obtain) the appropriate version of ROOT:

1. Click on: Launch the Installer.

2. Select the top-level package you are interested in (e.g., GlastRelease).

3. Select the appropriate Version (e.g., v6r2p1) and Tag.

4. Select the appropriate External packages folder.

Note: You may have to select a Destination folder before proceeding to the next step; however, as noted in the following step, you will not download any files to the Destination folder.

5. Deselect (i.e., Clear All) all of the Glast Files in that release.

6. Click on the External tab.

The Installer automatically checks the libraries installed on your machine and, by default, identifies any additional libraries needed. Note the Version of ROOT required for that release (e.g., v4.02.00).

7. If you do not already have the required version of ROOT installed on your machine, deselect all External Libraries except for ROOT and then click on the Install button.

Note: The installer automatically extracts the Root tree libraries for each code version.

8. To configure your environment to use ROOT as an Analysis Tool, refer to:

'Set ROOT Environment' for: Linux or Windows