Linker error when building GHC HEAD on Mac OS

[Stefan Holdermans]

I'm trying to build GHC HEAD on Mac OS 10.4.8 (PowerPC), but end up  
with a linker error:

   ../compiler/stage1/ghc-inplace -o stage2/ghc-6.7.20070228 -H16m -O  
-package ghc -Istage2 -cpp -fglasgow-exts -fno-generics -Rghc-timing - 
I. -IcodeGen -InativeGen -Iparser -Rghc-timing  -DGHCI -DDEBUGGER - 
threaded -fforce-recomp        stage2/main/Main.o
   /usr/bin/ld: warning multiple definitions of symbol _UP
   /usr/lib/gcc/powerpc-apple-darwin8/4.0.1/../../../libreadline.dylib 
(terminal.so) definition of _UP
   /usr/lib/gcc/powerpc-apple-darwin8/4.0.1/../../../libncurses.dylib 
(lib_termcap.o) definition of _UP
   /usr/bin/ld: warning multiple definitions of symbol _BC
   /usr/lib/gcc/powerpc-apple-darwin8/4.0.1/../../../libreadline.dylib 
(terminal.so) definition of _BC
   /usr/lib/gcc/powerpc-apple-darwin8/4.0.1/../../../libncurses.dylib 
(lib_termcap.o) definition of _BC
   /usr/bin/ld: warning multiple definitions of symbol _PC
   /usr/lib/gcc/powerpc-apple-darwin8/4.0.1/../../../libreadline.dylib 
(terminal.so) definition of _PC
   /usr/lib/gcc/powerpc-apple-darwin8/4.0.1/../../../libncurses.dylib 
(lib_tputs.o) definition of _PC
   /usr/bin/ld: Undefined symbols:
   _stg_interp_constr1_entry
   _stg_interp_constr2_entry
   _stg_interp_constr3_entry
   _stg_interp_constr4_entry
   _stg_interp_constr5_entry
   _stg_interp_constr6_entry
   _stg_interp_constr7_entry
   _stg_interp_constr8_entry
   collect2: ld returned 1 exit status
   <<ghc: 19070104 bytes, 4 GCs, 120108/120108 avg/max bytes  
residency (1 samples), 16M in use, 0.01 INIT (0.00 elapsed), 0.10 MUT  
(4.20 elapsed), 0.05 GC (0.08 elapsed) :ghc>>
   make[3]: *** [stage2/ghc-6.7.20070228] Error 1
   make[2]: *** [stage2/ghc-6.7.20070228] Error 2
   make[1]: *** [stage2] Error 2
   make: *** [bootstrap2] Error 2

Anyone any pointers?

Cheers,

   Stefan