[Zope-dev] Re: [Checkins] SVN: zc.buildout/branches/plus-minus-option-syntax-for-review/src/zc/buildout/buildout. A patch contributed by Mustapha Benali that provide - and + prefix operators for buildout configuration option values; this allow adding and removing option values to an already existing section option (applicable when extending configuration files). See also: http://answers.edge.launchpad.net/zc.buildout/+question/35159.