```
calculate ~ # emerge -s calculate-source
Local copy of remote index is up-to-date and will be used.
Searching...
[ Results for search key : calculate-source ]
[ Applications found : 1 ]
* sys-kernel/calculate-sources
Latest version available: 3.5.4-r1
Latest version installed: 3.5.3-r2
Size of files: 79,394 kB
Homepage: http://www.calculate-linux.org
Description: Full sources including the Calculate patchset for the 3.5 kernel tree
License: GPL-2 freedist
calculate ~ # emerge -av calculate-sources
Local copy of remote index is up-to-date and will be used.
These are the packages that would be merged, in order:
Calculating dependencies... done!
[binary U ] sys-apps/calculate-builder-2.2.30-r3::calculate [2.2.30::calculate] 64 kB
[ebuild NS ] sys-kernel/calculate-sources-3.5.4-r1::calculate [3.5.3-r2::calculate] USE="symlink vmlinuz -build -minimal" 79,395 kB
Total: 2 packages (1 upgrade, 1 in new slot, 1 binary), Size of downloads: 79,458 kB
!!! Multiple package instances within a single package slot have been pulled
!!! into the dependency graph, resulting in a slot conflict:
sys-apps/calculate-builder:0
(sys-apps/calculate-builder-2.2.30::calculate, installed) pulled in by
=sys-apps/calculate-builder-2.2.30 required by (sys-apps/calculate-utilities-2.2.30-r1::calculate, installed)
(sys-apps/calculate-builder-2.2.30-r3::calculate, binary scheduled for merge) pulled in by
>=sys-apps/calculate-builder-2.2.30-r3 required by (sys-kernel/calculate-sources-3.5.4-r1::calculate, ebuild scheduled for merge)
It may be possible to solve this problem by using package.mask to
prevent one of those packages from being selected. However, it is also
possible that conflicting dependencies exist such that they are
impossible to satisfy simultaneously. If such a conflict exists in
the dependencies of two different packages, then those packages can
not be installed simultaneously. You may want to try a larger value of
the --backtrack option, such as --backtrack=30, in order to see if
that will solve this conflict automatically.
For more information, see MASKED PACKAGES section in the emerge man
page or refer to the Gentoo Handbook.
```

Update `sys-apps/calculate-utilities`

by command

```
emerge -u calculate-utilities
```

After that install the kernel.