Check if Git is installed and if user.name and user.email
are configured globally.
Details
You can install Git from https://git-scm.com/downloads/
and configure your identity using the instructions at
https://git-scm.com/book/en/v2/Getting-Started-First-Time-Git-Setup.
You may find it convenient to run gert::git_config_global()
with name equal to user.name and user.email.