Thoroughly unsubtle, most mkdir -p should probably be INSTALL* at
*install stage, and echo/ECHO_MSG is somewhat unsorted.
It's quite possible I missed a few automated changes...
Porters: please make sure you use bsd.port.mk 1.75 or later when
updating ports. That version of the makefile adds all sums. Previous
versions of the makefile will still work for people installing ports.