n'utiliser 'south' que si la base n'est pas sqlite3

polynum/settings.py

@@ -131,7 +131,7 @@ TEMPLATE_CONTEXT_PROCESSORS = DEFAULT_SETTINGS.TEMPLATE_CONTEXT_PROCESSORS + (
         )
 
 INSTALLED_APPS = (
-    'south',
+    # note: 'south' will be added here only if database is not sqlite (see below)
     'django.contrib.auth',
     'django.contrib.contenttypes',
     'django.contrib.sessions',
@@ -205,6 +205,10 @@ try:
 except:
     pass
 
+# use South, unless if database is sqlite3
+if DATABASES['default']['ENGINE'] != 'django.db.backends.sqlite3':
+    INSTALLED_APPS = ('south',) + INSTALLED_APPS
+
 # CAS
 
 if CAS_SERVER_URL: