[m-dev.] Can someone tell me what the -I flag does for mmc?

[Ralph Becket]

The documentation for -I in the users' manual states:

   -I dir
   --search-directory dir
          Append dir to the list of directories to be searched for  
          imported modules.

But if I try `mmc --make b -I dir_a' where a.m lives in dir_a, the
compiler reports that it can't find the source code for module a.

So clearly -I doesn't do what I thought it did.  Can anybody tell
me (a) what -I does and (b) whether it is indeed possible to have
.m files in different directories and have them build using a
single invocation of mmc?

Ta,
-- Ralph
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