docs: update faq to mention apt for dependencies
@@ -37,6 +37,11 @@ which details your dependencies. See our guide on :ref:`guides/reproducible-buil
You can also set your project documentation to install your project itself
as a dependency.
+Additionally, your build may depend on extensions that require external,
+non-Python libraries to be installed. If you are using a :ref:`configuration
+file <config-file>` you can add libraries to the Ubuntu-based builder with
+``apt``.
+
If your project or its dependencies rely on C libraries,
see :ref:`faq:I get import errors on libraries that depend on C modules`.
