Virtualbox колизии

вообщем суть вопроса вот в чем при инстале virualbox-bin система говорит что нет исходников ядра
инсталю исходники ядра
emerge sabayon-sources

в ответ получаю

>>> Installing (1 of 2) sys-kernel/linux-sabayon-sources-2.6.31
 * This package will overwrite one or more files that may belong to other
 * packages (see list below). You can use a command such as `portageq
 * owners / <filename>` to identify the installed package that owns a
 * file. If portageq reports that only one package owns a file then do
 * NOT file a bug report. A bug report is only useful if it identifies at
 * least two or more packages that are known to install the same file(s).
 * If a collision occurs and you can not explain where the file came from
 * then you should simply ignore the collision since there is not enough
 * information to determine if a real problem exists. Please do NOT file
 * a bug report at http://bugs.gentoo.org unless you report exactly which
 * two packages install the same file(s). Once again, please do NOT file
 * a bug report unless you have completely understood the above message.
 * 
 * package sys-kernel/linux-sabayon-sources-2.6.31 NOT merged
 * 
 * Detected file collision(s):
 * 
 * 	/usr/src/linux-2.6.31-sabayon/include/linux/version.h
 * 
 * Searching all installed packages for file collisions...
 * 
 * Press Ctrl-C to Stop
 * 
 * sys-kernel/linux-sabayon-2.6.31
 * 	/usr/src/linux-2.6.31-sabayon/include/linux/version.h
 * 
 * Package 'sys-kernel/linux-sabayon-sources-2.6.31' NOT merged due to
 * file collisions. If necessary, refer to your elog messages for the
 * whole content of the above message.

дело я так понял в колизиях, первый раз с ними сталкиваюсь!
помоги пожалуйста!