.

component/ZEO/buildout.cfg

 # SlapOS component for ZEO.
 # https://zeo.readthedocs.io/
 
-# XXX ZEO4 is patched
+[buildout]
+extends =
+    ../git/buildout.cfg
 
+
+# ZEO allows to use either ZEO4 or ZEO5
+# To select which version to use users should do:
+#
+#   [ZEO]
+#   egg = ${ZEO<version>:egg}
+[ZEO]
+recipe  = zc.recipe.egg
+# egg   = ${ZEOx:egg}
+scripts = runzeo
+
+
+# ZEO4: we maintain our own 4-nxd branch with patches for wendelin.core to work
+# correctly. The patches are backports of what is in ZEO master (ZEO5), but
+# since upstream considers 4 branch to be "dead", we have to maintain it by ourselves.
+# See https://github.com/zopefoundation/ZEO/pull/161 for the reference.
+[ZEO4]
+recipe  = zc.recipe.egg:develop
+setup   = ${ZEO4-repository:location}
+egg     = ZEO
+
+[ZEO4-repository]
+recipe  = slapos.recipe.build:gitclone
+repository = https://lab.nexedi.com/kirr/ZEO.git
+branch  = 4-nxd
+revision= 7c1042977b91
+location = ${buildout:parts-directory}/ZEO4
+git-executable = ${git:location}/bin/git
+
+
+# ZEO5 is plain upstream egg
+[ZEO5]
+recipe  = zc.recipe.egg
+egg     = ZEO