env FEATURES="-collision-protect" emerge --oneshot sys-apps/portageでコケる

gistfile1.txt

>>> Emerging (1 of 32) sys-devel/gnuconfig-20120116
 * gnuconfig-20120116.tar.bz2 RMD160 SHA1 SHA256 size ;-) ...                                  [ ok ]
>>> Unpacking source...
>>> Unpacking gnuconfig-20120116.tar.bz2 to /Users/yuichi/Library/Gentoo/var/tmp/portage/sys-devel/gnuconfig-20120116/work
dyld: Library not loaded: /Users/yuichi/Library/Gentoo/usr/lib/libbz2.1.dylib
  Referenced from: /Users/yuichi/Library/Gentoo/bin/bzip2
  Reason: image not found
tar: This does not look like a tar archive
tar: Exiting with failure status due to previous errors
 * ERROR: sys-devel/gnuconfig-20120116 failed (unpack phase):
 *   failure unpacking gnuconfig-20120116.tar.bz2
 * 
 * Call stack:
 *               ebuild.sh, line   85:  Called src_unpack
 *             environment, line 2060:  Called unpack 'gnuconfig-20120116.tar.bz2'
 *        phase-helpers.sh, line  312:  Called _unpack_tar 'bzip2 -d'
 *        phase-helpers.sh, line  282:  Called assert_sigpipe_ok 'failure unpacking gnuconfig-20120116.tar.bz2'
 *   isolated-functions.sh, line   37:  Called die
 * The specific snippet of code:
 *   		[[ $x -ne 0 && $x -ne ${PORTAGE_SIGPIPE_STATUS:-141} ]] && die "$@"
 * 
 * If you need support, post the output of `emerge --info '=sys-devel/gnuconfig-20120116'`,
 * the complete build log and the output of `emerge -pqv '=sys-devel/gnuconfig-20120116'`.
 * The complete build log is located at '/Users/yuichi/Library/Gentoo/var/tmp/portage/sys-devel/gnuconfig-20120116/temp/build.log'.
 * The ebuild environment file is located at '/Users/yuichi/Library/Gentoo/var/tmp/portage/sys-devel/gnuconfig-20120116/temp/environment'.
 * Working directory: '/Users/yuichi/Library/Gentoo/var/tmp/portage/sys-devel/gnuconfig-20120116/work'
 * S: '/Users/yuichi/Library/Gentoo/var/tmp/portage/sys-devel/gnuconfig-20120116/work'

>>> Failed to emerge sys-devel/gnuconfig-20120116, Log file:

>>>  '/Users/yuichi/Library/Gentoo/var/tmp/portage/sys-devel/gnuconfig-20120116/temp/build.log'

 * Messages for package sys-devel/gnuconfig-20120116:

 * ERROR: sys-devel/gnuconfig-20120116 failed (unpack phase):
 *   failure unpacking gnuconfig-20120116.tar.bz2
 * 
 * Call stack:
 *               ebuild.sh, line   85:  Called src_unpack
 *             environment, line 2060:  Called unpack 'gnuconfig-20120116.tar.bz2'
 *        phase-helpers.sh, line  312:  Called _unpack_tar 'bzip2 -d'
 *        phase-helpers.sh, line  282:  Called assert_sigpipe_ok 'failure unpacking gnuconfig-20120116.tar.bz2'
 *   isolated-functions.sh, line   37:  Called die
 * The specific snippet of code:
 *   		[[ $x -ne 0 && $x -ne ${PORTAGE_SIGPIPE_STATUS:-141} ]] && die "$@"
 * 
 * If you need support, post the output of `emerge --info '=sys-devel/gnuconfig-20120116'`,
 * the complete build log and the output of `emerge -pqv '=sys-devel/gnuconfig-20120116'`.
 * The complete build log is located at '/Users/yuichi/Library/Gentoo/var/tmp/portage/sys-devel/gnuconfig-20120116/temp/build.log'.
 * The ebuild environment file is located at '/Users/yuichi/Library/Gentoo/var/tmp/portage/sys-devel/gnuconfig-20120116/temp/environment'.
 * Working directory: '/Users/yuichi/Library/Gentoo/var/tmp/portage/sys-devel/gnuconfig-20120116/work'
 * S: '/Users/yuichi/Library/Gentoo/var/tmp/portage/sys-devel/gnuconfig-20120116/work'