C noob: how to open Postfix in CLion?

Java dev here.

How to open Postfix (https://github.com/vdukhovni/postfix) in CLion so that it can resolve all the symbols and can build it without any issues?

When I open it in IDEA, it is asking for a CMakeLists.txt file but there is not such a file in this repo.

And how can I compile, run, and debug src/smtp/smtp.c?

Thanks in advance.