Use a local version of the ztk-sources.cfg file.

sources.cfg

 [buildout]
-extends = http://svn.zope.org/zopetoolkit/trunk/ztk-sources.cfg?revision=130246
+extends = ztk-sources.cfg
 
 [remotes]
 github = git://github.com/zopefoundation

ztk-sources.cfg

+[buildout]
+svn-zope-org = ^
+github = git://github.com/zopefoundation
+github_push = git@github.com:zopefoundation
+
+[sources]
+# Development branches of packages of *this* ZTK version.
+# (currently trunks, but should evolve to maintenance branches)
+# This set of branches is tested by some buildbots!
+
+# ZTK
+zope.annotation = git ${buildout:github}/zope.annotation
+zope.applicationcontrol = git ${buildout:github}/zope.applicationcontrol
+zope.authentication = git ${buildout:github}/zope.authentication
+zope.browser = git ${buildout:github}/zope.browser
+zope.browsermenu = git ${buildout:github}/zope.browsermenu
+zope.browserpage = git ${buildout:github}/zope.browserpage
+zope.browserresource = git ${buildout:github}/zope.browserresource
+zope.cachedescriptors = git ${buildout:github}/zope.cachedescriptors
+zope.catalog = git ${buildout:github}/zope.catalog
+zope.component = git ${buildout:github}/zope.component
+zope.componentvocabulary = git ${buildout:github}/zope.componentvocabulary
+zope.configuration = git ${buildout:github}/zope.configuration
+zope.container = git ${buildout:github}/zope.container
+zope.contentprovider = git ${buildout:github}/zope.contentprovider
+zope.contenttype = git ${buildout:github}/zope.contenttype
+zope.copy = git ${buildout:github}/zope.copy
+zope.copypastemove = git ${buildout:github}/zope.copypastemove
+zope.datetime = git ${buildout:github}/zope.datetime
+zope.deferredimport = git ${buildout:github}/zope.deferredimport
+zope.deprecation = git ${buildout:github}/zope.deprecation
+zope.dottedname = git ${buildout:github}/zope.dottedname
+zope.dublincore = git ${buildout:github}/zope.dublincore
+zope.error = git ${buildout:github}/zope.error
+zope.event = git ${buildout:github}/zope.event
+zope.exceptions = git ${buildout:github}/zope.exceptions
+zope.filerepresentation = git ${buildout:github}/zope.filerepresentation
+zope.formlib = git ${buildout:github}/zope.formlib
+zope.hookable = git ${buildout:github}/zope.hookable
+zope.i18n = git ${buildout:github}/zope.i18n
+zope.i18nmessageid = git ${buildout:github}/zope.i18nmessageid
+zope.index = git ${buildout:github}/zope.index
+zope.interface = git ${buildout:github}/zope.interface
+zope.intid = git ${buildout:github}/zope.intid
+zope.keyreference = git ${buildout:github}/zope.keyreference
+zope.lifecycleevent = git ${buildout:github}/zope.lifecycleevent
+zope.location = git ${buildout:github}/zope.location
+zope.login = git ${buildout:github}/zope.login
+zope.mimetype = git ${buildout:github}/zope.mimetype
+zope.minmax = git ${buildout:github}/zope.minmax
+zope.pagetemplate = git ${buildout:github}/zope.pagetemplate
+zope.password = git ${buildout:github}/zope.password
+zope.pluggableauth = git ${buildout:github}/zope.pluggableauth
+zope.principalannotation = git ${buildout:github}/zope.principalannotation
+zope.principalregistry = git ${buildout:github}/zope.principalregistry
+zope.processlifetime = git ${buildout:github}/zope.processlifetime
+zope.proxy = git ${buildout:github}/zope.proxy
+zope.ptresource = git ${buildout:github}/zope.ptresource
+zope.publisher = git ${buildout:github}/zope.publisher
+zope.ramcache = git ${buildout:github}/zope.ramcache
+zope.schema = git ${buildout:github}/zope.schema
+zope.security = git ${buildout:github}/zope.security
+zope.securitypolicy = git ${buildout:github}/zope.securitypolicy
+zope.sendmail = git ${buildout:github}/zope.sendmail
+zope.session = git ${buildout:github}/zope.session
+zope.site = git ${buildout:github}/zope.site
+zope.size = git ${buildout:github}/zope.size
+zope.structuredtext = git ${buildout:github}/zope.structuredtext
+zope.tal = git ${buildout:github}/zope.tal
+zope.tales = git ${buildout:github}/zope.tales
+zope.testing = git ${buildout:github}/zope.testing
+zope.testrunner = git ${buildout:github}/zope.testrunner
+zope.traversing = git ${buildout:github}/zope.traversing
+zope.viewlet = git ${buildout:github}/zope.viewlet