I've configured Jenkins do perform SVN checkout of a project and then run Phing build file in it.

My project has file externals, which is allowed in subversion 1.6 working copy format.

I don't know for what reason, but Jenkins checks out a my project using older (I guess 1.5 working copy format) instead of 1.6 which is last supported.

Here are errors from build log:

Fetching 'svn://in-portal.org/in-portal/branches/5.2.x/COPYRIGHT' at -1 into '/mnt/hd/home/alex/.jenkins/jobs/In-Portal/workspace/src/COPYRIGHT'
svn:externals to a file requires Subversion 1.6 workspace support. Use the system configuration to enable that.

I've found no option in Jenkins/SVN plugin configuration to indicate preferred working copy format.

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Jenkins version: 1.460
SVN plugin version: 1.39