Gentooでパッケージをブロックする問題があります

clamavパッケージ自体がアップグレードを妨げているようです。 Portageは最新で、Portageツリーは同期されています。 Gentooでパッケージをブロックしてこの問題を解決する方法を知っている人はいますか？

# emerge -uDpv clamav

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

Calculating dependencies... done!
[ebuild     U  ] app-arch/bzip2-1.0.6-r7::gentoo [1.0.6-r6::gentoo] USE="-static -static-libs" 764 KiB
[ebuild     U  ] sys-apps/file-5.25::gentoo [5.22::gentoo] USE="-python -static-libs -zlib" PYTHON_TARGETS="python2_7 (-pypy) -python3_3 -python3_4" 723 KiB
[ebuild     U  ] dev-libs/expat-2.1.1-r2::gentoo [2.1.0-r5::gentoo] USE="unicode -examples -static-libs" 396 KiB
[ebuild     U  ] sys-apps/debianutils-4.7::gentoo [4.4::gentoo] USE="-static" 153 KiB
[ebuild     U ~] dev-libs/libgpg-error-1.24::gentoo [1.22::gentoo] USE="-common-lisp -nls -static-libs" 766 KiB
[ebuild     U  ] dev-libs/libffi-3.2.1::gentoo [3.0.13-r1::gentoo] USE="-debug -pax_kernel -static-libs {-test}" 919 KiB
[ebuild     U  ] sys-devel/m4-1.4.17::gentoo [1.4.16::gentoo] USE="-examples" 1,123 KiB
[ebuild     U  ] app-misc/pax-utils-1.1.6::gentoo [1.0.3::gentoo] USE="-caps -debug% -python -seccomp%" 633 KiB
[ebuild     U  ] app-arch/tar-1.28-r1::gentoo [1.27.1-r2::gentoo] USE="acl -minimal -nls (-selinux) -static -xattr" 2,631 KiB
[ebuild     U  ] dev-libs/openssl-1.0.2h-r2::gentoo [1.0.2h::gentoo] USE="-asm -bindist -gmp -kerberos -rfc3779 -sctp -sslv2% -sslv3% -static-libs {-test} -tls-heartbeat -vanilla -zlib" CPU_FLAGS_X86="-sse2" 0 KiB
[ebuild     U ~] app-eselect/eselect-python-20160516::gentoo [20160222::gentoo] 46 KiB
[ebuild     U  ] dev-libs/libpcre-8.38-r1:3::gentoo [8.38:3::gentoo] USE="bzip2 cxx readline (unicode) -jit -libedit -pcre16 -pcre32 -recursion-limit -static-libs -zlib" 1,526 KiB
[ebuild     U  ] dev-util/gtk-doc-am-1.25::gentoo [1.24::gentoo] 658 KiB
[ebuild     U ~] dev-lang/python-2.7.12:2.7::gentoo [2.7.11-r2:2.7::gentoo] USE="gdbm ncurses readline ssl threads (wide-unicode) xml (-berkdb) -build -doc -examples -hardened -ipv6 -libressl -sqlite -tk -wininst" 12,114 KiB
[ebuild     U  ] dev-libs/libxml2-2.9.4:2::gentoo [2.9.3:2::gentoo] USE="python readline -debug -examples -icu -ipv6 -lzma -static-libs {-test}" PYTHON_TARGETS="python2_7 -python3_3 -python3_4 (-python3_5)" 5,249 KiB
[ebuild     U  ] app-admin/perl-cleaner-2.20::gentoo [2.19::gentoo] 7 KiB
[ebuild     U  ] dev-libs/libxslt-1.1.29::gentoo [1.1.28-r5::gentoo] USE="crypt -debug -examples -python -static-libs" PYTHON_TARGETS="python2_7" 3,349 KiB
[ebuild     U  ] sys-devel/gettext-0.19.7::gentoo [0.19.4::gentoo] USE="acl cxx ncurses -cvs -doc -emacs -git -java -nls -openmp -static-libs" 18,785 KiB
[ebuild     U  ] dev-libs/glib-2.46.2-r3:2::gentoo [2.46.2-r2:2::gentoo] USE="-dbus -debug (-fam) -mime (-selinux) -static-libs -systemtap {-test} -utils -xattr" PYTHON_TARGETS="python2_7" 0 KiB
[ebuild     U  ] app-antivirus/clamav-0.99::gentoo [0.98.7::gentoo] USE="bzip2 -clamdtop -iconv -ipv6 (-libressl) -metadata-analysis-api -milter (-selinux) -static-libs (-uclibc)" 15,594 KiB
[blocks B      ] <app-antivirus/clamav-0.99 ("<app-antivirus/clamav-0.99" is hard blocking app-antivirus/clamav-0.99)

Total: 20 packages (20 upgrades), Size of downloads: 65,428 KiB
Conflict: 1 block (1 unsatisfied)

 * Error: The above package list contains packages which cannot be
 * installed at the same time on the same system.

  (app-antivirus/clamav-0.99:0/0::gentoo, ebuild scheduled for merge) pulled in by
    app-antivirus/clamav required by @selected
    clamav
    app-antivirus/clamav required by (mail-filter/qmail-scanner-2.08:0/0::gentoo, installed)

# grep -R clamav /etc/portage/*
/etc/portage/package.use:app-antivirus/clamav   -* crypt
/etc/portage/package.use:mail-filter/qmail-scanner spamassassin  clamav
/etc/portage/package.use:mail-filter/dspam      clamav daemon mysql procmail virtual-users
/etc/portage/package.use:app-antivirus/clamav   crypt bzip2 
# grep clamav /etc/make.conf 
#