Apparently, the ncurses in openSUSE Leap-15.2 has the following:
Since we have a struct member named ESCDELAY, we can't actually set
it at all when this macro is defined.

The three possibilities to deal with this are:
1) Rename the ESCDELAY member.
   Likely the best option long-term, but I don't want to find everything
   and update it at this time.
2) Avoid using the ESCDELAY member #ifdef ESCDELAY
   Which makes it not work in the exact set of circumstances it makes
   sense in.
3) #include curs_fix.h from ciolib.h
   This actually renames the ESCDELAY member to _nc_ESCDELAY, but you
   won't be able to actually notice this.