VirtualBox не ставитсо :(

на одну машину поставилсо без проблем :) на другую не хочет. где не хочет - ядро gentoo-sources-2.6.24 и xen-sources-2.6.20-r6
на одном и на другом ядре кричит:

* Could not detect kernel version.
* Please ensure that /usr/src/linux points to a complete set of Linux sources.
*
* ERROR: app-emulation/virtualbox-modules-1.5.2-r1 failed.
* Call stack:
* ebuild.sh, line 1717: Called dyn_setup
* ebuild.sh, line 768: Called qa_call 'pkg_setup'
* ebuild.sh, line 44: Called pkg_setup
* virtualbox-modules-1.5.2-r1.ebuild, line 26: Called linux-mod_pkg_setup
* linux-mod.eclass, line 465: Called linux-info_pkg_setup
* linux-info.eclass, line 595: Called die
* The specific snippet of code:
* get_version || die "Unable to calculate Linux Kernel version"
* The die message:
* Unable to calculate Linux Kernel version
*
* If you need support, post the topmost build error, and the call stack if relevant.
* A complete build log is located at '/var/tmp/portage/app-emulation/virtualbox-modules-1.5.2-r1/temp/build.log'.

в обоих случаях загружен правильный кернел. /usr/src/linux правильно ссылаетсо :(
в build.log ничего нету кроме ^^^
пробовал app-emulation/virtualbox-modules-1.5.2-r1 и app-emulation/virtualbox-modules-1.5.4
оба в варианте app-emulation/virtualbox и app-emulation/virtualbox-bin

мистика, однако :(