It seems that the current approach taken by HOC is to strip preprocessing directives. This may not have been a problem before Leopard but Cocoa header files are now full of macros in most unusual places, e.g. @interface NSObject (NSDeprecatedMethods) + (void)poseAsClass:(Class)aClass DEPRECATED_IN_MAC_OS_X_VERSION_10_5_AND_LATER; @end I'm trying to figure out the easiest way to run CPP over the header files before processing them in HOC. Is there a CPP written in Haskell and packaged as a library? Does someone have a quick Haskell solution for running CPP over a header file (with include paths?), redirecting into a temp file and reading that back into Haskell? Should I preprocess all Cocoa header files using make and then read these in? Thanks, Joel -- http://wagerlabs.com