Moar Python 2.5 BBB pinning.

setup.py

 import os
+import sys
 
 from setuptools import setup
 from setuptools import find_packages
@@ -13,6 +14,9 @@ except:
     CHANGES = ''
 
 requires = ['ZODB3']
+if sys.version_info[:2] < (2, 6):
+    requires.insert(0, 'zope.interface>=3.6.0,<4.0dev')
+    requires.insert(0, 'transaction<1.2')
 tests_require = requires + ['mock']
 
 setup(name='zodburi',

tox.ini

@@ -6,6 +6,13 @@ envlist =
 commands = 
     python setup.py test -q
 
+[testenv:py25]
+deps =
+    zope.interface>=3.6.0,<4.0dev
+    transaction<1.2
+commands = 
+    python setup.py test -q
+
 [testenv:cover]
 basepython =
     python2.6