Once libraries have been installed, the user's environment must be correctly set up for the usage of the Geant4 toolkit. The Configure script provides a way to check the existing installation and provide the correct configuration for the user's environment. Configuration scripts env[.sh.csh] can be generated, and should be sourced by the final users in order to configure their environment according to the performed installation.

To generate the configuration scripts, the user should run Configure placed in the installation area, as follows:

 > $G4INSTALL/Configure

This will generate the shell script env.csh (env.sh for bash shell) to be sourced or integrated into the shell login script (.tcshrc or .bashrc). The shell script will be generated in the user's current directory ($PWD). The user can customize it to specify for example her/his proper working directory through the variable $G4WORKDIR. Once the generated script is sourced, the user will be ready to start building a Geant4 application.

Refer to section the section Getting Started with Geant4 - How to Make an Executable Program of the Geant4 User's Guide for Application Developers for information on how to build an executable in Geant4.