interface 

You can use this option in link descriptions and compilation descriptions.

By specifying this option, you can ensure that a module file cannot be updated once it has been translated (for example, an interface). For this purpose, a file with the extension .i is created on the computer, on which module files with this option are translated.

This module file can only be translated again when VMAKE no longer finds a file of this name with the extension .i in the path hierarchy (VMAKE_PATH).