( http://ports.haiku-files.org/ticket/408)

HaikuPorter is a Python script to assist in building packages for Haiku.  Haikuporter is able to retrieve source code files that have been bzipped, gzipped, tarred and feathered, well not feathered, but it can handle the others.  But it can't yet handle .xz files, nor does Python's tar module, so you will probably need to use some other ways to solve this one.  You'll need to figure out a clean fix for this and then create a .bep file that retrieves a source file that has been compressed using .xz to verify your fix works.  Hint, many of the GNU packages are now using .xz.