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Gentoo Linux: "Package NOT merged due to file collisions" problem and solution

When trying to get the latest sys-libs/timezone-data on a somewhat old system, I got the following error:
[list of nearly all files the package was about to install]
- Package 'sys-libs/timezone-data-2008i' NOT merged due to file
- collisions. If necessary, refer to your elog messages for the whole
- content of the above message.


According to equery, it looks like those files were installed by glibc:
# equery b /usr/share/zoneinfo/CET
sys-libs/glibc-2.3.4.20041102-r1 (/usr/share/zoneinfo/CET)


So I tried
# COLLISION_IGNORE="/usr/share/zoneinfo" emerge -av timezone-data
which showed less errors but still gave me:
 - sys-libs/glibc-2.3.4.20041102-r1
- /usr/bin/tzselect
- /usr/sbin/zdump
- /usr/sbin/zic


I ended up with
# COLLISION_IGNORE="/usr" emerge -av timezone-data
which worked well.

I looked at the ebuilds and saw that newer glibc packages depend on sys-libs/timezone-data, so upgrading glibc should solve the problem too. I've submitted bug 258802 since I didn't find the info anywhere else.