The syntax for dep calls is:
The dep function is for specifying dependencies, it takes a non-zero number of parameters that should be paths to existing directories and files, which adds them all as dependencies for the file being built.
Note: You can also add file dependencies manually by adding a .deps file residing in the same directory as the content file. For example if you have content/index.content as the content file add a content/index.deps file containing the extra dependencies you want to track.
Example of dep being used with f++:
Example of dep being used with n++: