build problem: ddd 3.3.7 link errors on HP-UX 10.20

[SEIP,CHRISTOPHER (HP-Roseville,ex1)]

I am having trouble at the final link stage of compiling ddd 3.3.7 on HP-UX
10.20.  (Using: gcc 3.3.1, binutils 2.14, GNU make 3.80, and the ld that's
built into HP-UX).

When building the ddd executable, the linker complains about unsatisfied
symbols:
   typeinfo name for HintGraphNode(data)
   typeinfo name for _StatusMsg(data)
   typeinfo name for AgentManager(data)
   typeinfo name for ReadLineAgent(data)
   typeinfo name for StatusMsg(data)
   typeinfo name for AsyncAgent(data)
   typeinfo name for PosGraphNode(data)
   typeinfo name for StatusDelay(data)
   typeinfo name for Graph(data)
   typeinfo name for TTYAgent(data)
   typeinfo name for LiterateAgent(data)
Collect2: ld returned 1 exit status

Any advice you can provide would be appreciated!  Thanks,

--Chris--