Is there an alternative to http://www.hoovy.org/HaskellXcodePlugin/ i can use for XCode 4 whilst using Mac OS X Lion ?
Or if it works, how can i build the Plugin under Lion?
Unfortunately, I do not think there is a solution to Haskell coding in XCode. Notice the project you referenced was in beta stage 5 years ago, and has not seen any development since! Your best IDE bet is probably EclipseFP, which has very nice Haskell support in Eclipse. This is what I use. The only disadvantage is using the clunky Eclipse interface instead of the elegant XCode interface.
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