diff --git a/group-by-date.cabal b/group-by-date.cabal
--- a/group-by-date.cabal
+++ b/group-by-date.cabal
@@ -1,5 +1,5 @@
 Name:           group-by-date
-Version:        0.1.0.1
+Version:        0.1.0.2
 License:        BSD3
 License-File:   LICENSE
 Author:         Henning Thielemann <haskell@henning-thielemann.de>
@@ -49,7 +49,7 @@
 Build-Type:     Simple
 
 Source-Repository this
-  Tag:         0.1.0.1
+  Tag:         0.1.0.2
   Type:        darcs
   Location:    http://hub.darcs.net/thielema/group-by-date/
 
@@ -63,7 +63,7 @@
     filemanip >=0.3.5 && <0.4,
     pathtype >=0.8 && <0.9,
     time >=1.5 && <1.9,
-    unix-compat >=0.3 && <0.5,
+    unix-compat >=0.3 && <0.6,
     explicit-exception >=0.1 && <0.2,
     transformers >=0.2 && <0.6,
     utility-ht >=0.0.1 && <0.1,
diff --git a/src/Main.hs b/src/Main.hs
--- a/src/Main.hs
+++ b/src/Main.hs
@@ -20,6 +20,17 @@
 import Text.Printf (printf, )
 
 
+{-
+parseCard :: String -> Exc.Exceptional String Int
+parseCard str =
+   case reads str of
+      [(n,"")] ->
+         if n>=0
+           then return n
+           else Exc.throw $ "negative number: " ++ str
+      _ -> Exc.throw $ "could not parse cardinal " ++ show str
+-}
+
 
 data Flags =
    Flags {