http://puredata.info/Members/zmoelnig/news/subversion-relocation
The documentation about svn relocate only applies to subversion-1.7, users of older versions (eg subversion-1.6.17 found in Debian Wheezy) must use svn switch --relocate - perhaps something like this:
cd ~/code/pure-data
svn switch --relocate https://pure-data.svn.sourceforge.net/svnroot/pure-data/trunk https://svn.code.sf.net/p/pure-data/svn/trunk
svn update
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