Creating a .di file for a custom C library

[Brad]

I would like to use an updated version of the Termbox library 
(written in C) with D.  I have the .h file.  This is new 
territory for me (why try something easy - right?).  I think I 
need to create a .di file that corresponds to the .h file.  I 
also suspect that I need to put the library file (C code) into 
the project as a file somehow.  I am probably just not looking in 
the right place for the documentation, but I cannot seem to find 
a lot of guidance in this area.

Thanks in advance.