It happens with unmodified HEAD too. Sigh. Can anyone help? Simon From: ghc-devs [mailto:ghc-devs-bounces@haskell.org] On Behalf Of Simon Peyton Jones Sent: 26 October 2015 21:19 To: ghc-devs@haskell.org Subject: Can't build on Windows 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 $