a licensing violation by linking to both libreadline (GPLv3+) and a libvirt.so containing virtualbox code (LGPLv2-only) at the same time (those two licenses are incompatible).
For the record ... as far as I know, LGPLv2, both -only and -later, is compatible with GPLv-anything (in contrast to LGPLv-anything), due to the conversion clause. I quote from http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html: 3. You may opt to apply the terms of the ordinary GNU General Public License instead of this License to a given copy of the Library. To do this, you must alter all the notices that refer to this License, so that they refer to the ordinary GNU General Public License, version 2, instead of to this License. (If a newer version than version 2 of the ordinary GNU General Public License has appeared, then you can specify that version instead if you wish.) [...] k