2 The following errors will cause portability problems on other environments:
3 Error: [invalid-path-win] The path 'n?ul/*.a' is invalid on Windows, which would cause portability problems for this package. Windows file names cannot contain any of the characters ":*?<>|", and there are a few reserved names including "aux", "nul", "con", "prn", "com{1-9}", "lpt{1-9}" and "clock$".
4 Error: Hackage would reject this package.