Fail early with old sqlalchemy.

1 files changed, 5 insertions, 0 deletions

diff --git a/sphinx/websupport/storage/sqlalchemystorage.py b/sphinx/websupport/storage/sqlalchemystorage.py
index ba011c06d..baef24816 100644
--- a/sphinx/websupport/storage/sqlalchemystorage.py
+++ b/sphinx/websupport/storage/sqlalchemystorage.py
@@ -11,9 +11,14 @@
 
 from datetime import datetime
 
+import sqlalchemy
 from sqlalchemy.orm import aliased
 from sqlalchemy.sql import func
 
+if sqlalchemy.__version__[:3] < '0.5':
+    raise ImportError('SQLAlchemy version 0.5 or greater is required for this '
+        'storage backend; you have version %s' % sqlalchemy.__version__)
+
 from sphinx.websupport.errors import CommentNotAllowedError, \
      UserNotAuthorizedError
 from sphinx.websupport.storage import StorageBackend