Can't build on Windows

[Simon Peyton Jones]

Gurgah.   GHC is broken on my windows laptop.  See below.  Anyone have any ideas?  Frustrating.
Oddly the symbol is defined in the .exe

bash$ nm inplace/bin/ghc-stage2.exe | grep stg_upd_frame

02c248e0 T _stg_upd_frame_info
This is admittedly on a branch that I have modified; but I have only modified stuff in the front end, nothing in the RTS etc.  I suppose I will try to build a unmodified HEAD too.
can anyone help?  Thanks!
Simon


bash$ c:/code/HEAD/inplace/bin/ghc-stage2 --interactive

GHCi, version 7.11.20151026: http://www.haskell.org/ghc/  :? for help

ghc-stage2.exe: unable to load package `ghc-prim-0.4.0.0'

ghc-stage2.exe: C:\code\HEAD\libraries\ghc-prim\dist-install\build\HSghc-prim-0.4.0.0.o: unknown symbol `_stg_upd_frame_info'

HEAD $
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