JIT is part of a platform's runtime environment, not part of its build environment. Since you appear to be a super-pedant, I'll revise my initial statement to:
> If you're installing any tooling or programs on a production server or opening ports other than those strictly necessary for running your production application (as a pre-built binary or package whenever applicable) conforming to industry standards for that application/server environment, you're doing it wrong.
> If you're installing any tooling or programs on a production server or opening ports other than those strictly necessary for running your production application (as a pre-built binary or package whenever applicable) conforming to industry standards for that application/server environment, you're doing it wrong.