[Checkins] [zopefoundation/Zope] 4f2cf4: Use the requirements as the index is broken

[GitHub]

  Branch: refs/heads/2.13
  Home:   https://github.com/zopefoundation/Zope
  Commit: 4f2cf42517c4d9f43e27a9cf1a5fc4dd016356f3
      https://github.com/zopefoundation/Zope/commit/4f2cf42517c4d9f43e27a9cf1a5fc4dd016356f3
  Author: Michael Howitz <mh at gocept.com>
  Date:   2017-10-14 (Sat, 14 Oct 2017)

  Changed paths:
    M doc/INSTALL-virtualenv.rst

  Log Message:
  -----------
  Use the requirements as the index is broken

Using the previously described variant using the index led to a broken installation because `pip` installs `Products.ZCatalog` 4.x. It expects to find `products.zcatalog` in the index. (Even downgrading to pip 1.5 does not help.)