What do I need to do to "register" 'latexpdf' for Sphinx?

Question

When I run Sphinx using 'latexpdf' I get an error, even though I have a complete working TeX installation on my machine:

Sphinx error: Builder name latexpdf not registered

What do I need to do to "register" latexpdf?

Answer 1

Use -M instead of -b. This invokes sphinx-build similarly to make latexpdf, e.g.:

sphinx-build -M latexpdf . _build

See @mzjn's answer for details.