+-------------------------------------------------------------------------------+
| build.tcl                                                                     |
+-------------------------------------------------------------------------------+
+-------------------------------------------------------------------------------+
| kettle                                                                        |
|        +----------------------------------------------------------------------+
|        | +-------------+ +----------------+ +-------------+ +-----------------+
|        | | kettle::tcl | | kettle::tclapp | | kettle::doc | | kettle::figures |
+--------+ +-------------+ +----------------+ +-------------+ +-----------------+
+-------------------------------------------------------------------------------+
| kettle, kettle::util                                                          |
+-------------------------------------------------------------------------------+