${basedir} variable makes portable builds overly difficult

Please reopen MNG-3198. I believe that Brett misunderstood what Jochen wrote. There is no simple workaround with the current Maven implementation. Jochen was saying that Maven should use unix-style slashes under Windows for the sake of portability and let users convert to Windows-style slashes themselves if they wish to use an external script.

Simple use-case: try passing a $

-relative path into the "java.library.path" property. It's impossible to do this portably under Maven's existing implementation.