diff -dur requests-2.18.2.orig/requests/certs.py requests-2.18.2/requests/certs.py
--- requests-2.18.2.orig/requests/certs.py	2017-05-31 11:19:09.000000000 +0200
+++ requests-2.18.2/requests/certs.py	2017-08-01 14:30:44.000000000 +0200
@@ -12,7 +12,14 @@
 environment, you can change the definition of where() to return a separately
 packaged CA bundle.
 """
-from certifi import where
+
+import os
+
+if os.path.exists("/etc/certs/ca-certificates.crt"):
+     def where():
+        return "/etc/certs/ca-certificates.crt"
+else:
+    from certifi import where
 
 if __name__ == '__main__':
     print(where())