[Omake] omake equivalent of make's $?

[Bryce Nichols]

Hi all,

I'm trying to set up something for my projects so that when I type "omake 
install", then only the changed files are copied, and also if any files 
that were previously installed but that are no longer part of the install 
set will be removed.

The point is to be a bit more efficient and keep from polluting the 
filesystem as the project evolves.

The problem is, I don't know how to learn from omake which files have 
changed.  With make, I could just use the automatic variable $? to get the 
list of dependencies which had changed.  omake doesn't seem to have this 
feature.

So is there a way to get the list of only the changed dependencies in the 
body of an omake rule?

Also, if anyone has comments or insight about my idea for tracking 
installed files, I'd love to hear from you.

Thanks!

--bryce