This discussion is no longer live and is left here as an archive.
In computing the 4th definition (building on something else) is completely wrong. At best, it is completely redundant (exactly) with definition #2. (NB: Definition #1 is currently RFV'ed.) --Connel MacKenzie 22:37, 4 October 2007 (UTC)
Trying to be too general, I think. I've replaced it with a specific programming def. DAVilla 05:31, 5 October 2007 (UTC)