diff -ur requests-2.4.0.orig/requests/certs.py requests-2.4.0/requests/certs.py
--- requests/certs.py	2014-08-20 00:52:58.000000000 +0800
+++ requests/certs.py	2014-09-09 14:17:33.237264068 +0800
@@ -18,6 +18,10 @@
 except ImportError:
     def where():
         """Return the preferred certificate bundle."""
+        cacerts = '/etc/ssl/certs/ca-certificates.crt'
+        if os.path.exists(cacerts):
+            return cacerts
+
         # vendored bundle inside Requests
         return os.path.join(os.path.dirname(__file__), 'cacert.pem')