We have the distribution that satisfies 'zc.recipe.testrunner==1.2.1'.
While:
  Installing.
  Getting section alltests.
  Initializing part alltests.
  Getting section test.
  Initializing section test.
  Installing recipe zc.recipe.testrunner.
Error: There is a version conflict.
We already have: zope.testing 4.1.1
but zc.recipe.testrunner 1.2.1 requires 'zope.testing>=3.6.0,<3.10.0'.