Improved error messages about missing dependencies

kcc/image.py

@@ -21,11 +21,20 @@ __copyright__ = '2012-2013, Ciro Mattia Gonano <ciromattia@gmail.com>, Pawel Jas
 __docformat__ = 'restructuredtext en'
 
 import os
+from sys import platform
 try:
     # noinspection PyUnresolvedReferences
     from PIL import Image, ImageOps, ImageStat, ImageChops
     if tuple(map(int, ('2.2.1'.split(".")))) > tuple(map(int, (Image.PILLOW_VERSION.split(".")))):
         print "ERROR: Pillow 2.2.1 or newer is required!"
+        if platform.startswith('linux'):
+            #noinspection PyUnresolvedReferences
+            import Tkinter
+            #noinspection PyUnresolvedReferences
+            import tkMessageBox
+            importRoot = Tkinter.Tk()
+            importRoot.withdraw()
+            tkMessageBox.showerror("KCC - Error", "Pillow 2.2.1 or newer is required!")
         exit(1)
 except ImportError:
     print "ERROR: Pillow is not installed!"