Unlike its earlier versions, Subversion 1.8 support uses the native command line client instead of SVNKit to run commands. This approach is more flexible and makes the support of upcoming versions much easier. Now, IntelliJ IDEA offers different integration options for each specific Subversion:
you have to install SVN command line client. 1.6 – SVNKit only 1.7 – SVNKit and command line client 1.8 – Command line client only
If you opt to the command line client, make sure you have its binaries installed on your machine, because they are not bundled with IntelliJ IDEA.