As of version 2.0.6, X10DT is available as an all-in-one zip file that contains Eclipse, X10DT plugins and all its·prerequisites.
The X10 DT Eclipse Based Editor for Linux X86 64 bit is available here:
http://dist.codehaus.org/x10/x10dt/2.0/releases/x10dt-2.0.6-linux.gtk.x86_64.zip