This tex sample file illustrates how to use the dirtree package:

(...)

\usepackage{dirtree}

(...)

\begin{figure}
  \input{doc_dirs}
  \caption{the documentation folder}
  \label{fig_doc_dirs}
\end{figure}

(...)

The file doc_dirs.tex is generated using the makefile and included into a figure environment, because referencing to it is easier this way.