A user in #gentoo ran into this: >>> Unpacking mtd-utils-snapshot-20100718-02ae0aac87576d07202a62d11294ea55b56f450b.tar.xz to /var/tmp/portage/sys-fs/mtd-utils-20100718/work /usr/lib/portage/bin/ebuild.sh: line 365: xz: command not found tar: This does not look like a tar archive tar: Exiting with failure status due to previous errors\ The ebuild uses an xz tarball but does not DEPEND on xz-utils. Despite its wide usage, xz-utils is not part of the system set for any profile.
This concerns also other packages: files=$(grep "\.tar\.xz" /usr/portage/*-*/*/*.ebuild | grep -v "$(echo -e "\t")\#" | cut -d: -f1 | uniq) && grep -L app-arch/xz-utils $files | cut -d/ -f4- app-admin/system-config-printer-common/system-config-printer-common-1.2.2.ebuild app-admin/system-config-printer-common/system-config-printer-common-1.2.4.ebuild app-admin/system-config-printer-common/system-config-printer-common-1.2.5.ebuild app-admin/system-config-printer-gnome/system-config-printer-gnome-1.2.2.ebuild app-admin/system-config-printer-gnome/system-config-printer-gnome-1.2.4.ebuild app-admin/system-config-printer-gnome/system-config-printer-gnome-1.2.5.ebuild app-dicts/goldendict/goldendict-0.9.0_p20100410.ebuild app-misc/hello/hello-2.6.ebuild app-text/dvipsk/dvipsk-5.99_p20100722.ebuild app-text/ps2pkm/ps2pkm-1.5_p20100722.ebuild app-text/xdvipdfmx/xdvipdfmx-0.7.8_p20100722.ebuild dev-libs/kpathsea/kpathsea-6.0.0_p20100722.ebuild dev-libs/ptexenc/ptexenc-1.1.0_p20100722.ebuild dev-tex/bibtexu/bibtexu-3.71_p20100722.ebuild kde-base/oxygen-icons/oxygen-icons-4.5.3.ebuild kde-base/oxygen-icons/oxygen-icons-4.5.4.ebuild media-fonts/heuristica/heuristica-0.2.1.ebuild media-video/mplayer/mplayer-1.0_rc4_p20101114.ebuild media-video/mplayer/mplayer-1.0_rc4_p20101219.ebuild media-video/mplayer/mplayer-9999.ebuild net-dialup/capi4k-utils/capi4k-utils-20050718-r4.ebuild net-firewall/xtables-addons/xtables-addons-1.28-r1.ebuild net-firewall/xtables-addons/xtables-addons-1.30.ebuild net-firewall/xtables-addons/xtables-addons-1.31.ebuild net-libs/libisds/libisds-0.4.ebuild net-libs/libisds/libisds-9999.ebuild sci-geosciences/josm/josm-3.208.ebuild sci-geosciences/josm/josm-3592.ebuild sci-geosciences/josm/josm-3695.ebuild sci-geosciences/josm-plugins/josm-plugins-20100531.ebuild sci-geosciences/josm-plugins/josm-plugins-20101206.ebuild sys-apps/grep/grep-2.7.ebuild sys-devel/autoconf-archive/autoconf-archive-2010.07.06.ebuild sys-devel/autoconf-archive/autoconf-archive-2010.08.19.ebuild sys-devel/autoconf-archive/autoconf-archive-2010.10.26.ebuild sys-devel/binutils-apple/binutils-apple-3.2.2.ebuild sys-devel/binutils-apple/binutils-apple-3.2.3-r1.ebuild sys-devel/binutils-apple/binutils-apple-3.2.3-r2.ebuild sys-devel/binutils-apple/binutils-apple-3.2-r1.ebuild sys-fs/mtd-utils/mtd-utils-20100718.ebuild sys-fs/mtd-utils/mtd-utils-99999999.ebuild
This shouldn't be an issue now that xz-utils has been added to the base system set.
