diff --git a/NEWS.txt b/NEWS.txt
index f2790eea78f098448b977aa6cab836e30a742503..9c441d4824e5f830518eeacd2a222605103b3390 100644
--- a/NEWS.txt
+++ b/NEWS.txt
@@ -2,6 +2,15 @@ What's new in ZODB3 3.3 ?
 =========================
 Release date: DD-MMM-YYYY
 
+BTrees
+------
+
+The BTrees __init__.py file is now just a comment.  It had been trying
+to set up support for (long gone) "int sets", and to import an old
+version of Zope's Interface package, which doesn't even ship with ZODB.
+The latter in particular created problems, at least clashing with
+PythonCAD's Interface package.
+
 Tools
 -----
 
diff --git a/src/BTrees/__init__.py b/src/BTrees/__init__.py
index 3d38d97590fcb3ee84768d29274f712b04fe0d81..f8981395d335f2f5e7a11e91befdb874514181ad 100644
--- a/src/BTrees/__init__.py
+++ b/src/BTrees/__init__.py
@@ -1,16 +1 @@
-try:
-    import intSet
-except:
-    pass
-else:
-    del intSet
-
-# Register interfaces
-try:
-    import Interface
-except ImportError:
-    pass # Don't register interfaces if no scarecrow
-else:
-    import Interfaces
-    del Interfaces
-    del Interface
+# This is a Python package.