spm works maybe?

packages/tar.pkg

@@ -7,6 +7,6 @@
     ],
     "dependencies": [],
     "version": "",
-    "hash": "2549429f0686c88354b091cbbd0cd7f80148115178cb3e5198924de28c7da6f4",
-    "tarball": "http://localhost:8000/packages/raw/tar.tar.xz"
+    "hash": "328ad76df75b9a0bc55f4fed0e31d7dd",
+    "tarball": "http://localhost:8000/packages/raw/tar.tar.gz"
 }