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Example: wxHello-cpp ==================== This is a modified version of the wxHello example which shows how to remove the dependency on cabal-macosx when on non-OSX platforms. cabal-macosx is only relevant on OSX; if used on any other platform, it does nothing. Thus, you can always safely include it in your program's Build-Depends and Setup.hs, whatever the target platform. However, you might not want to do that. This example shows how to modify your .cabal file and your Setup.hs so that cabal-macosx is only required on OSX. There are three changes necessary to create this platform-sensitivity: 1. wxHello.cabal is modified so that cabal-macosx is only in the Build-Depends list if the O/S is darwin. 2. Setup.hs is modified so that cabal-macosx code is only imported and compiled if the O/S is darwin. 3. Calls to runghc Setup.hs are given the -cpp flag to invoke the C preprocessor, eg: "runghc -cpp Setup configure". In all other respects this example is identical to the plain wxHello example. Please see the README for the plain wxHello example for any further information.