🚀 go-pugleaf

I am trying to install G++ v1.31 on a SUN 3/280 running under SunOS 4.0.1 with
GCC v1.31 as my C compiler. I am getting the error "undefined: _reverse_condition"
when compiling c++ (the last stage of the make). However, I find that the
function reverse_condition is called in expr.c and jump.c and is defined in jump.c.
Could this be due to an error in my configuration settings? a gcc/linker problem?
the makefile? Any and all suggestions are welcome. This problem has our local gurus
stumped. Thanks.

--Bruce Cameron
  bmc@bru.mayo.edu
  
------------------
errors 

gcc -g -o c++ -msoft-float toplev.o version.o cplus-parse.tab.o tree.o print-tree.o  cplus-decl.o cplus-typeck.o stor-layout.o fold-const.o  rtl.o expr.o stmt.o expmed.o explow.o optabs.o varasm.o  symout.o dbxout.o sdbout.o emit-rtl.o insn-emit.o  integrate.o jump.o cse.o loop.o flow.o stupid.o combine.o  regclass.o local-alloc.o global-alloc.o reload.o reload1.o insn-peep.o  final.o recog.o insn-recog.o insn-extract.o insn-output.o  cplus-lex.o cplus-overload.o cplus-class.o cplus-init.o cplus-method.o c


plus-convert.o cplus-search.o /usr/lib/debug/malloc.o -lg obstack.o  -lc
Undefined:
_reverse_condition
*** Error code 1
make: Fatal error: Command failed for target `c++'


grep reverse_condition *.c
expr.c:   extern enum rtx_code reverse_condition ();
expr.c:   enum rtx_code code = reverse_condition (GET_CODE (comparison));
jump.c:static enum rtx_code reverse_condition ();
jump.c:    codei = reverse_condition (codei);
jump.c:    codet = reverse_condition (codet);
jump.c:reverse_condition (code)