Checkout source from Subversion

Go to File / New / Other and select Maven / Checkout Maven Projects from SCM:

Select the svn type and type the url https://openkm.svn.sourceforge.net/svnroot/openkm/trunk/openkm to refer version 5.0:

Select the svn type and type the url https://openkm.svn.sourceforge.net/svnroot/openkm/branches/4.0/openkm to refer version 4.0:

Be patient, first time you downloading OpenKM from svn, you're downloading all libraries to your maven repository. It could take several minutes depending your Internet connection.

After OpenKM will be downloaded, and automatically compiled.

If you want native support for Subversion, you have to install the libsvn-java package in Linux. The edit the eclipse.ini configuration file and add the following line:

-Djava.library.path=/usr/lib/jni