title: dpkg error: contains ununderstood data member
body: <p>I'm trying to install a jailbreak tweak using <code>make package install</code> but I'm receiving this error from dpkg:</p>
  
  <pre><code>dpkg-deb: file `/tmp/_theos_install.deb' contains ununderstood data member data.tar.xz     , giving up
  dpkg: error processing /tmp/_theos_install.deb (--install):
  subprocess dpkg-deb --fsys-tarfile returned error exit status 2
  Errors were encountered while processing:
  /tmp/_theos_install.deb
  make: *** [internal-install] Error 1
  </code></pre>
  
  <p>So as far as I can tell it isn't able to understand the .xz extension, but I'm not sure why that file is being created. Thanks for the help.</p>