Hi, As from my previous mail to haskell-cafe I'm trying to get started working with a few haskell tools. I'm now trying to get hat to build, but hitting a problem while compiling. The error I get is: Hat/Hat.hs:265: Couldn't match `IOError' against `GHC.IOBase.Exception' Expected type: GHC.IOBase.Exception -> GHC.IOBase.IO (R a) Inferred type: IOError -> GHC.IOBase.IO a1 In the second argument of `catch', namely `exceptionHandler' In a 'do' expression: catch (toIO toId mkRoot (forceExp gmain)) exceptionHandler Hat/Hat.hs:274: Couldn't match `GHC.IOBase.Exception' against `IOError' Expected type: GHC.IOBase.Exception Inferred type: IOError In the first argument of `ioErrors', namely `exception' In the scrutinee of a case expression: ioErrors exception make[1]: *** [/Users/tatd100/Desktop/project/hat-2.02/targets/powerpc-Darwin6/obj/ hatlib/ghc/Hat/Hat.o] Error 1 make: *** [targets/powerpc-Darwin6/hat-lib-ghc] Error 2 during: ghc -I/Users/tatd100/Desktop/project/hat-2.02/include '-#include "hat-c.h"' -cpp -c -o /Users/tatd100/Desktop/project/hat-2.02/targets/powerpc-Darwin6/obj/ hatlib/ghc/Hat/Hat.o Hat/Hat.hs Any help again is much appreciated. Thanks Tom Davie