spm works maybe?

packages/deflate.pkg

@@ -7,6 +7,6 @@
     ],
     "dependencies": [],
     "version": "1.0.0-release",
-    "hash": "e35f29c486d4a002e46b5c4e85676c480310829b606fc72d093ed86e7daab91d",
-    "tarball": "http://localhost:8000/packages/raw/deflate.tar.xz"
+    "hash": "2c6544d7c8e72522f84b5d88ba30e7e7",
+    "tarball": "http://localhost:8000/packages/raw/deflate.tar.gz"
 }