--- /dev/null
+deb http://xvm.mit.edu/invirt unstable main invirt-system
+deb-src http://xvm.mit.edu/invirt unstable main invirt-system
+deb http://xvm-dev.mit.edu/invirt unstable main invirt-system
+deb-src http://xvm-dev.mit.edu/invirt unstable main invirt-system