The question does not indicate "reuse" or "link to" or any other aspect that suggests that the person wants to incorporate SVNKit into their software. Taken literally βI use SVNKitβ as a tool, then the question is misinformed. Reading the license for SVNKit, she says that it can be used without restrictions:
http://svnkit.com/licensing/index.html
In particular, it says that if you can redistribute svnkit only as part of your software, if your software itself is open source. This is similar to all the GNU developer tools and compilers that ship with the GPL; these companies have been developing closed source software for decades at large corporations that take licenses very seriously. Until you embed the tool code in your own product, there is no problem using this tool to create closed-source software.
This is a common misconception about SVNKit that confused me, so I answered.
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