Allow docs to be built with Sphinx 0.5.x.
diff --git a/Doc/tools/sphinxext/suspicious.py b/Doc/tools/sphinxext/suspicious.py
index ae11793..245a759 100644
--- a/Doc/tools/sphinxext/suspicious.py
+++ b/Doc/tools/sphinxext/suspicious.py
@@ -45,7 +45,12 @@
import csv
import re
from docutils import nodes
-from sphinx.builders import Builder
+
+try:
+ from sphinx.builders import Builder
+except ImportError:
+ from sphinx.builder import Builder
+
detect_all = re.compile(ur'''
::(?=[^=])| # two :: (but NOT ::=)