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.
was defined in bsd.port.mk was checked before bsd.port.mk was included;
this should make ports with optional shared libs build on the alpha,
again. However, chages require the latest bsd.port.mk