The upgrade process from Alpine 2.1 to 2.2 stopped showing the next message:
“ERROR: perl-net-dns: Trying to overwrite usr/lib/perl5/core_perl/perllocal.pod owned by perl-mail-clamav.”

The workaround:

apk del perl-mail-clamav; apk upgrade; apk add —force perl-mail-clamav

Adding perl-mail-clamav again had the same problem: “perllocal.pod owned by perl-net-dns”
This bug seems to be related to http://bugs.alpinelinux.org/issues/244

(from redmine: issue id 656, created on 2011-05-21, closed on 2011-05-24)

• Changesets:
  • Revision af250c4e by Leonardo Arena on 2011-05-21T13:13:24Z:

main/perl-mail-clamav: fix file collision. Fixes #656

• Revision b3115650 by Leonardo Arena on 2011-05-21T13:16:59Z:

main/perl-mail-clamav: fix file collision. Fixes #656
(cherry picked from commit af250c4e4bbb9504bf8469f0c43d075490253c5f)