localhost linux-3.15.0-gentoo-r1 # emerge -uav gentoo-sources

These are the packages that would be merged, in order:

Calculating dependencies                                 ... done!
[ebuild  N     ] sys-fs/static-dev-0.1  0 kB
[ebuild  NS   ~] sys-kernel/gentoo-sources-3.15.6:3.15.6 [3.15.0-r1:3.15.0-r1, 3.15.3:3.15.3, 3.15.5:3.15.5] USE="-build -deblob -experimental -symlink" 0 kB

Total: 2 packages (1 new, 1 in new slot), Size of downloads: 0 kB

Would you like to merge these packages? [Yes/No] Yes
>>> Verifying ebuild manifests
>>> Emerging (1 of 2) sys-fs/static-dev-0.1
>>> Installing (1 of 2) sys-fs/static-dev-0.1
>>> Failed to install sys-fs/static-dev-0.1, Log file:
>>>  '/var/tmp/portage/sys-fs/static-dev-0.1/temp/build.log'
>>> Jobs: 0 of 2 complete, 1 failed                 Load avg: 0.46, 0.28, 0.24
 * Package:    sys-fs/static-dev-0.1
 * Repository: gentoo
 * Maintainer: base-system@gentoo.org
 * USE:        abi_x86_64 amd64 elibc_glibc kernel_linux userland_GNU
 * FEATURES:   distcc preserve-libs sandbox userpriv usersandbox
>>> Unpacking source...
>>> Source unpacked in /var/tmp/portage/sys-fs/static-dev-0.1/work
>>> Compiling source in /var/tmp/portage/sys-fs/static-dev-0.1/work ...
>>> Source compiled.
>>> Test phase [not enabled]: sys-fs/static-dev-0.1

>>> Install static-dev-0.1 into /var/tmp/portage/sys-fs/static-dev-0.1/image/ category sys-fs
>>> Completed installing static-dev-0.1 into /var/tmp/portage/sys-fs/static-dev-0.1/image/

 * checking 0 files for package collisions
>>> Merging sys-fs/static-dev-0.1 to /

 * We have detected that you currently use udev or devfs or devtmpfs
 * and this ebuild cannot install to the same mount-point.
 * Please reinstall the ebuild (as root) like follows:
 *
 * mkdir /tmp/newroot
 * mount -o bind / /tmp/newroot
 * ROOT=/tmp/newroot/ emerge sys-fs/static-dev
 * umount /tmp/newroot
 * ERROR: sys-fs/static-dev-0.1::gentoo failed (preinst phase):
 *   Cannot install on udev/devfs tmpfs.
 *
 * Call stack:
 *     ebuild.sh, line  93:  Called pkg_preinst
 *   environment, line 163:  Called die
 * The specific snippet of code:
 *           die "Cannot install on udev/devfs tmpfs.";
 *
 * If you need support, post the output of `emerge --info '=sys-fs/static-dev-0.1::gentoo'`,
 * the complete build log and the output of `emerge -pqv '=sys-fs/static-dev-0.1::gentoo'`.
 * The complete build log is located at '/var/tmp/portage/sys-fs/static-dev-0.1/temp/build.log'.
 * The ebuild environment file is located at '/var/tmp/portage/sys-fs/static-dev-0.1/temp/environment'.
 * Working directory: '/usr/lib64/portage/pym'
 * S: '/var/tmp/portage/sys-fs/static-dev-0.1/work/static-dev-0.1'
!!! FAILED preinst: 1

 * Messages for package sys-fs/static-dev-0.1:

 * We have detected that you currently use udev or devfs or devtmpfs
 * and this ebuild cannot install to the same mount-point.
 * Please reinstall the ebuild (as root) like follows:
 *
 * mkdir /tmp/newroot
 * mount -o bind / /tmp/newroot
 * ROOT=/tmp/newroot/ emerge sys-fs/static-dev
 * umount /tmp/newroot
 * ERROR: sys-fs/static-dev-0.1::gentoo failed (preinst phase):
 *   Cannot install on udev/devfs tmpfs.
 *
 * Call stack:
 *     ebuild.sh, line  93:  Called pkg_preinst
 *   environment, line 163:  Called die
 * The specific snippet of code:
 *           die "Cannot install on udev/devfs tmpfs.";
 *
 * If you need support, post the output of `emerge --info '=sys-fs/static-dev-0.1::gentoo'`,
 * the complete build log and the output of `emerge -pqv '=sys-fs/static-dev-0.1::gentoo'`.
 * The complete build log is located at '/var/tmp/portage/sys-fs/static-dev-0.1/temp/build.log'.
 * The ebuild environment file is located at '/var/tmp/portage/sys-fs/static-dev-0.1/temp/environment'.
 * Working directory: '/usr/lib64/portage/pym'
 * S: '/var/tmp/portage/sys-fs/static-dev-0.1/work/static-dev-0.1'

 * GNU info directory index is up-to-date.