How to use #ifdef WIN32

I want to switch code on the OS but this always goes through to the #else (on windows or elsewhere): {-# OPTIONS -cpp #-} #ifdef WIN32 main = putStrLn "hello windows" #else main = putStrLn "hello something else" #endif Does this depend on a Makefile setting WIN32, or should there be something predefined? Thanks, -- View this message in context: http://www.nabble.com/How-to-use--ifdef-WIN32-tp14448173p14448173.html Sent from the Haskell - Glasgow-haskell-users mailing list archive at Nabble.com.