Sigh. The Simon PJ Windows Buildbot reports "inplace/bin/ghc-stage1.exe" -optc-fno-stack-protector -optc-Wall -optc-Werror -optc-Wall -optc-Wextra -optc-Wstrict-prototypes -optc-Wmissing-prototypes -optc-Wmissing-declarations -optc-Winline -optc-Waggregate-return -optc-Wpointer-arith -optc-Wmissing-noreturn -optc-Wnested-externs -optc-Wredundant-decls -optc-Iincludes -optc-Iincludes/dist -optc-Iincludes/dist-derivedconstants/header -optc-Iincludes/dist-ghcconstants/header -optc-Irts -optc-Irts/dist/build -optc-DCOMPILING_RTS -optc-fno-strict-aliasing -optc-fno-common -optc-Irts/dist/build/./autogen -optc-Wno-error=inline -optc-O2 -optc-fomit-frame-pointer -optc-g -optc-DRtsWay=\"rts_v\" -optc-DWINVER=0x06000100 -static -O0 -H64m -Wall -fllvm-fill-undef-with-garbage -Werror -Iincludes -Iincludes/dist -Iincludes/dist-derivedconstants/header -Iincludes/dist-ghcconstants/header -Irts -Irts/dist/build -DCOMPILING_RTS -this-unit-id rts -dcmm-lint -i -irts -irts/dist/build -Irts/dist/build -irts/dist/build/./autogen -Irts/dist/build/./autogen -O2 -Wnoncanonical-monad-instances -c rts/CheckUnload.c -o rts/dist/build/CheckUnload.o In file included from rts\CheckUnload.c:16:0: error: rts\LinkerInternals.h:284:15: error: error: unknown type name 'UChar' STATIC_INLINE UChar * ^ rts\LinkerInternals.h: In function 'myindex': rts\LinkerInternals.h:288:11: error: error: 'UChar' undeclared (first use in this function) ((UChar*)base) + scale * index; ^ rts\LinkerInternals.h:288:11: error: note: each undeclared identifier is reported only once for each function it appears in rts\LinkerInternals.h:288:17: error: error: expected expression before ')' token ((UChar*)base) + scale * index; ^ rts\LinkerInternals.h:285:28: error: error: unused parameter 'base' [-Werror=unused-parameter] myindex ( int scale, void* base, int index ) ^ rts\LinkerInternals.h: At top level: rts\LinkerInternals.h:292:5: error: error: unknown type name 'UChar' UChar* name, ^ rts\LinkerInternals.h:293:5: error: error: unknown type name 'UChar' UChar* strtab); ^ cc1.exe: all warnings being treated as errors `gcc.exe' failed in phase `C Compiler'. (Exit code: 1) make[1]: *** [rts/ghc.mk:255: rts/dist/build/CheckUnload.o] Error 1 make[1]: *** Waiting for unfinished jobs.... make: *** [Makefile:127: all] Error 2 /c/code/HEAD-1$