The new UnaryStatistic class depends on the fft library but is located in Util/units/ so the compiler can't find the include files if building from a fresh checkout ("UnaryStatistic.C:9:10: fatal error: FTransform.h: No such file or directory"). Same goes for BinaryStatistic although that one does not use any fft code so doesn't really need to include FTransform.h.
Maybe solution is to move these to More/General/?
Dang. I wondered about that at the time that I #included FTransform.h
... I'll move these files to a new home.
Sorry about that. Thanks for the notice!
I've checked in a fix and I'll soon try a "make distcheck"
Thanks Willem!