With ghc-5.02.2 running from a Makefile in a cygwin shell under Windows XP, the following behaviour occurs: ghc -package lang -package posix -c -o /d/haskell/hmake-3.00/targets/ix86-CYGWIN_NT-5.1/obj/hmake/QSort.o QSort.hs Assembler messages: FATAL: Can't create \d\haskell\hmake-3.00\targets\ix86-CYGWIN_NT-5.1\obj\hmake\QSort.o: No such file or directory It looks like ghc has reversed the slashes in the filepath given to the -o option, and this is the reason the assembler fails. The directory certainly exists, but we suspect cygwin only understands the forward-slash form not the backward-slash form. Is this a bug in ghc? Or is there some option we can give to persuade ghc not to reverse the slashes? Regards, Malcolm