headers question

[Andy Gilman <amgilman myfairpoint net>]

I have been working with Gtkmm for about a month, and there are numerous 
things I am sure I need to know, but what I am wondering about now has 
to do with the headers.  In most of the Gtkmm examples, the 
comprehensive "include <gtkmm.h> is used.  I have copied this and of 
course it works fine.  But would it speed up compilation if I could 
identify just the files I actually needed?  And is there an efficient 
way to do this?  And does either pattern make a difference in the speed 
with which the executable file is executed?

Andy Gilman