There is not need to extend from a stack

software/erp5testnode/software.cfg

 [buildout]
+extensions =
+  slapos.rebootstrap
+  slapos.tool.networkcache
+  slapos.zcbworkarounds
+  mr.developer
+
+find-links = http://www.nexedi.org/static/packages/source/slapos.buildout/
+    http://dist.repoze.org
+    http://www.nexedi.org/static/packages/source/
+
+versions = versions
+rebootstrap-section = python2.6
 extends =
-  ../../stack/erp5testnode.cfg
+  ../../component/python-2.6/buildout.cfg
+  ../../component/subversion/buildout.cfg
+  ../../component/git/buildout.cfg
+  ../../component/lxml-python/buildout.cfg
+  ../../component/zip/buildout.cfg
 
-parts +=
+parts =
   template
+  bootstrap
+  eggs
+  subversion
+  zip
+  git
+
+[bootstrap]
+recipe = zc.recipe.egg
+eggs = zc.buildout
+suffix =
+scripts =
+    buildout=bootstrap2.6
+arguments = sys.argv[1:] + ["bootstrap"]
+
+[rebootstrap]
+section = python2.6
+version = 1
+
+[versions]
+# Use SlapOS patched zc.buildout
+zc.buildout = 1.5.3-dev-SlapOS-001
+
+[eggs]
+recipe = zc.recipe.egg
+eggs =
+  ${lxml-python:egg}
+  erp5.recipe.testnode
+  slapos.toolbox
 
 [template]
 recipe = slapos.cookbook:template