In message , at 12:03:26 on Thu, 26 Nov
2015, Robin remarked:
Hard to put one's finger on it. It is using the verb "build" as a
noun in an untraditional way. Building is the noun derived from to
build.
The OED's oldest example of "build" as a noun (= "a building") is
attributed to 1387. It shows it as obsolete but changes in English
usage are often "back to the future"
Also commonly used the last 20 years in software engineering to describe
the output from an assembler/compiler/linker.
eg My Android phone is running Build number LMY48T
--
Roland Perry