stg_upd_frame_info still broken

[Simon Peyton Jones]

Friends
I still cannot build GHC on Windows.  On Ben's advice I dumped my current msys setup and re-installed msys64 as described here https://ghc.haskell.org/trac/ghc/wiki/Building/Preparation/Windows
I cloned an entirely new GHC repository.
Then 'sh validate'.
Same result as before: any attempt to run GHCi fails with an unresolved symbol.

bash$ c:/code/HEAD-1/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-1\libraries\ghc-prim\dist-install\build\HSghc-prim-0.4.0.0.o: unknown symbol `_stg_upd_frame_info'

How could I actually find what the problem is?   Trying random things and hoping the problem goes away clearly is not working.
Very stuck and deeply frustrated
Thanks
Simon
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