What's the syntax for paths in include directives? How do they get resolved?

Question

What’s the syntax for paths in include directives? How do they get resolved?

Answer

An include directive is the include keyword followed by a string literal (in quotes). The string is a conventional file path for the OS on which you are running and is the full file name with extension. The filepath can be either absolute or relative; if relative, it is relative to the current working directory (i.e., the result of pwd on Linux).

As of version 3.7.3, there is no “include path” that might allow paths relative to other locations, but it is a feature request.