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.

/* re-enable this in misc.c if it starts working */
#define HH(a,b,c) a b c
HH(1,
2,
3
)
HH(4,
     5,
       6)