DMD -i option, simple question...

[WhatMeWorry]

The DMD forum mentions internal design. This is more of a 
beginner usage question.

---------------------  from Compiler Switches 
-----------------------------

-I=directory
     Look for imports also in directory

-i[=pattern ]

     Enables "include imports" mode, where the compiler will 
include imported modules in the compilation, as if they were 
given on the command line. By default, when this option is 
enabled, all imported modules are included except those in 
druntime/phobos

----------------------------------------------------------------------------

The "..when this option is enabled..." is exactly the behavior I 
want, but how is it enabled?  Is there an "all inclusive pattern" 
that I'm missing.