Adjust to the moving target called the C++ standard. Apparently nowadays it's not allowed to define an explicit copy constructor but not an assignment operator. Consequently, defining the explicit copy constructor in terms of the implicit/automatic assignment operator for general convenience no longer works. Add assignment operators. Caution: not tested with the IBM compiler, but there's no particular reason it shouldn't work.

SUBDIRS=bugs contrib parsifal oldagsrc examples ffcalc silly
# eval-e eval-p

include $(TOP)/mk/testsubdir.mk