Ryan Your commit d9c13cb8f5be89a030783d758fcf7c077351c6a9 breaks the build of ‘haskeline’ on Windows. See below. I think the fix is to remove the #let from libraries/haskeline/./System/Console/Haskeline/Backend/Win32.hsc. Could you make that, or whatever the right fix is, happen? Thanks Simon "inplace/bin/hsc2hs.exe" '--cc=C:/code/HEAD/inplace/mingw/bin/gcc.exe' '--ld=C:/code/HEAD/inplace/mingw/bin/gcc.exe' --cflag=-Wall --cflag=-Werror --cflag=-fno-stack-protector --cflag=-Dx86_64_HOST_ARCH=1 --cflag=-Dmingw32_HOST_OS=1 --cflag=-D__GLASGOW_HASKELL__=711 '--cflag=-fno-stack-protector' '--cflag=-Wall' '--cflag=-Werror' '--cflag=-Ilibraries/haskeline/dist-install/build/autogen' '--cflag=-Ilibraries/haskeline/includes' '--cflag=-DUSE_GHC_ENCODINGS' '--cflag=-DMINGW' '--cflag=-IC:\code\HEAD\libraries\directory\include' '--cflag=-IC:\code\HEAD\libraries\time\lib/include' '--cflag=-IC:\code\HEAD\libraries\containers\include' '--cflag=-IC:\code\HEAD\libraries\Win32\include' '--cflag=-IC:\code\HEAD\libraries\bytestring\include' '--cflag=-IC:\code\HEAD\libraries\base\include' '--cflag=-IC:\code\HEAD\libraries\integer-gmp\include' '--cflag=-IC:/code/HEAD/rts/dist/build' '--cflag=-IC:/code/HEAD/includes' '--cflag=-IC:/code/HEAD/includes/dist-derivedconstants/header' '--cflag=-Wno-error=inline' '--lflag=-LC:\code\HEAD\libraries\transformers\dist-install\build' '--lflag=-LC:\code\HEAD\libraries\directory\dist-install\build' '--lflag=-LC:\code\HEAD\libraries\time\dist-install\build' '--lflag=-LC:\code\HEAD\libraries\filepath\dist-install\build' '--lflag=-LC:\code\HEAD\libraries\containers\dist-install\build' '--lflag=-LC:\code\HEAD\libraries\Win32\dist-install\build' '--lflag=-LC:\code\HEAD\libraries\bytestring\dist-install\build' '--lflag=-LC:\code\HEAD\libraries\deepseq\dist-install\build' '--lflag=-LC:\code\HEAD\libraries\array\dist-install\build' '--lflag=-LC:\code\HEAD\libraries\base\dist-install\build' '--lflag=-LC:\code\HEAD\libraries\integer-gmp\dist-install\build' '--lflag=-LC:\code\HEAD\libraries\ghc-prim\dist-install\build' '--lflag=-LC:/code/HEAD/rts/dist/build' '--lflag=-luser32' '--lflag=-lgdi32' '--lflag=-lwinmm' '--lflag=-ladvapi32' '--lflag=-lshell32' '--lflag=-lshfolder' '--lflag=-lwsock32' '--lflag=-luser32' '--lflag=-lshell32' '--lflag=-lm' '--lflag=-lwsock32' '--lflag=-lgdi32' '--lflag=-lwinmm' '--lflag=-lmingwex' --cflag=-Ilibraries/haskeline/dist-install/build/autogen --cflag=-include --cflag=libraries/haskeline/dist-install/build/autogen/cabal_macros.h libraries/haskeline/./System/Console/Haskeline/Backend/Win32.hsc -o libraries/haskeline/dist-install/build/System/Console/Haskeline/Backend/Win32.hs Win32.hsc:170:0: error: "hsc_alignment" redefined [-Werror] In file included from libraries/haskeline/dist-install/build/System/Console/Haskeline/Backend/Win32_hsc_make.c:1:0: C:\code\HEAD\inplace/lib/template-hsc.h:88:0: note: this is the location of the previous definition #define hsc_alignment(t...) \ ^ cc1.exe: all warnings being treated as errors