Really didn't know what cruft was, so ....

"The origin of the term is uncertain, but it may be derived[original research?] from Harvard University's Cruft Laboratory (built in 1915 as a gift from a donor named Harriet Otis Cruft[3]), which was the Harvard Physics Department's radar lab during World War II. As late as the early 1990s, unused technical equipment could be seen stacked in front of Cruft Hall's windows. According to students, if a place filled with useless machinery is called Cruft Hall, the machinery itself must be cruft. This image of "discarded technical clutter" quickly migrated from hardware to software. Cruft may also be a play on the archaic medial "s", rendering "crust" as "cruſt".[4] In the TMRC dictionary, the relation to the term "crud" (dirt, crap) is pointed out by humorously defining the better known word (crud) by the more obscure one (cruft).[2]"