XXX try buildout patch

stack/slapos.cfg

@@ -40,6 +40,7 @@ exec-sitecustomize = false
 find-links +=
   http://www.nexedi.org/static/packages/source/
   http://www.nexedi.org/static/packages/source/hexagonit.recipe.download/
+  https://lab.nexedi.com/nexedi/slapos.buildout/raw/55b2acb0af009d8754fcdbbebc9a5b0690afea86/dist/zc.buildout-2.7.1+slapos005a.tar.gz
   http://www.nexedi.org/static/packages/source/slapos.buildout/
 
 # Use only quite well working sites.
@@ -60,6 +61,7 @@ allow-hosts +=
   sourceforge.net
   www.dabeaz.com
   www.owlfish.com
+  lab.nexedi.com
 
 # Use an https index
 index = https://pypi.org/simple/
@@ -118,7 +120,7 @@ eggs =
 [versions]
 setuptools = 44.0.0
 # Use SlapOS patched zc.buildout
-zc.buildout = 2.7.1+slapos004
+zc.buildout = 2.7.1+slapos005a
 # Use SlapOS patched zc.recipe.egg (zc.recipe.egg 2.x is for Buildout 2)
 zc.recipe.egg = 2.0.3+slapos003
 # Use own version of h.r.download to be able to open .xz and .lz archives