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To edit the code, you need to have the code. This means you need to check out a working copy from the public Subversion source repository. As straightforward as that might sound, the task can be slightly tricky. Because Subversion's source code is versioned using Subversion itself, you actually need to “bootstrap” by getting a working Subversion client via some other method. The most common methods include downloading the latest binary distribution (if such is available for your platform), or downloading the latest source tarball and building your own Subversion client. If you build from source, make sure to read the INSTALL file in the top level of the source tree for instructions.

After you have a working Subversion client, you are now poised to checkout a working copy of the Subversion source repository from http://svn.collab.net/repos/svn/trunk/: ^[46]

$ svn checkout http://svn.collab.net/repos/svn/trunk subversion
A    subversion/HACKING
A    subversion/INSTALL
A    subversion/README
A    subversion/autogen.sh
A    subversion/build.conf
…

The above command will checkout the bleeding-edge, latest version of the Subversion source code into a subdirectory named subversion in your current working directory. Obviously, you can adjust that last argument as you see fit. Regardless of what you call the new working copy directory, though, after this operation completes, you will now have the Subversion source code. Of course, you will still need to fetch a few helper libraries (apr, apr-util, etc.)—see the INSTALL file in the top level of the working copy for details.