diff --git a/Merge/Dependencies.hs b/Merge/Dependencies.hs
--- a/Merge/Dependencies.hs
+++ b/Merge/Dependencies.hs
@@ -125,7 +125,6 @@
           _ | otherwise      -> raw_haskell_deps
     test_deps :: Portage.Dependency
     test_deps = Portage.mkUseDependency (True, Portage.Use "test") $
-                    Portage.set_build_slot $
                     Portage.DependAllOf $
                     -- remove depends present in common section
                     filter (\d -> not (Portage.dep_as_broad_as d raw_haskell_deps)) $
diff --git a/hackport.cabal b/hackport.cabal
--- a/hackport.cabal
+++ b/hackport.cabal
@@ -1,5 +1,5 @@
 Name:           hackport
-Version:        0.4.1
+Version:        0.4.2
 License:        GPL
 License-file:   LICENSE
 Author:         Henning Günther, Duncan Coutts, Lennart Kolmodin
diff --git a/mk_release_tarball.bash b/mk_release_tarball.bash
--- a/mk_release_tarball.bash
+++ b/mk_release_tarball.bash
@@ -23,6 +23,6 @@
         # cabal is not able to unpack long tar names
         rm -rf -- cabal/Cabal/tests
     )
-    tar -czf "${tarball_name}" "${P}"/
+    TAR_OPTIONS=--format=ustar tar -czf "${tarball_name}" "${P}"/
 )
 rm -rf -- "${tempdir}"