So when I upgrade from 6.10 to 6.12 a LONG time ago, there was a bug where hsc2hs would emit INCLUDE pragmas and ghc didn't like that. So I hacked around it with an extra grep -v step in the Makefile. I always meant to go fix it for real in hsc2hs and finally I came back to that TODO item. I took a look at the hsc2hs source, and discovered it's surrounding the INCLUDE line with #elif __GLASGOW_HASKELL__ < 610 However, that macro is never defined for me, so it always emits the bogus INCLUDE line. I can't find anywhere that defines that macro, but there is a lot of "__GLASGOW_HASKELL && ...". So I modified utils/hsc2hs/C.hs from ... "#elif __GLASGOW_HASKELL__ < 610\n"++ " printf (\"{-# INCLUDE %s #-}\\n\", \""++ showCString s++"\");\n"++ "#endif\n" to "#elif __GLASGOW_HASKELL__ && __GLASGOW_HASKELL__ < 610\n"++ " printf (\"{-# INCLUDE %s #-}\\n\", \""++ showCString s++"\");\n"++ "#endif\n" And my problem is solved. Is this the correct solution? Where is that macro defined? I don't know how to mail patches with git, but anyway it's trivial so I don't think it's needed :)