I'm trying to build Hugs 2008-09-28 snapshot using MinGW 4.2.1-dw2, however it fails with messages below. I don't think the problem is in the C compiler, since it occurs when runhugs preprocesses Hugs libraries. Here's a few last lines from the output: Preprocessing System/Cmd Preprocessing System/Process Preprocessing System/Process/Internals Preprocessing System/Random runhugs: Error occurred ERROR "hugsdir/packages\directory\System\Directory.hs":366 - Undefined data constructor "UnsupportedOperation" runhugs: Error occurred ERROR "hugsdir/packages\base\Text\ParserCombinators\ReadP.hs":133 - Syntax error in type expression (unexpected `.') runhugs: Error occurred ERROR "hugsdir/packages\directory\System\Directory.hs":366 - Undefined data constructor "UnsupportedOperation" echo timestamp for boot libraries >../hugsdir/.bootstamp cd ../cpphs; HUGSFLAGS=-P{Hugs}/packages/\* HUGSDIR=../hugsdir ../src/runhugs -98 Setup.hs configure --verbose --hugs --prefix='/usr/local' --scratchdir='../hugsdir/packages/cpphs' --with-compiler=../src/ffihugs --with-hugs=../src/hugs runhugs: Error occurred ERROR "../hugsdir/packages\base\System\Posix\Internals.hs" - Error while importing DLL "../hugsdir/packages\base\System\Posix\Internals.dll" make[1]: *** [../hugsdir/programs/cpphs/Main.hs] Error 1 make[1]: Leaving directory `/d/Sources/hugs-2008-09-28/libraries' make: *** [all] Error 2 -- View this message in context: http://www.nabble.com/Failed-to-build-Hugs-2008-09-28-snapshot-tp21866438p21... Sent from the Haskell - Hugs-Bugs mailing list archive at Nabble.com.