When I try to make grub config withount os-prober installed, it not detect win-7 loader: $ sudo grub2-mkconfig -o /boot/grub2/grub.cfg Generating grub.cfg ... Found linux image: /boot/kernel-3.6.8 Found linux image: /boot/kernel-3.6.7 Found linux image: /boot/kernel-3.6.6 done But when I install os-prober: $ sudo grub2-mkconfig -o /boot/grub2/grub.cfgGenerating grub.cfg ... Found linux image: /boot/kernel-3.6.8 Found linux image: /boot/kernel-3.6.7 Found linux image: /boot/kernel-3.6.6 No volume groups found Found Windows 7 (loader) on /dev/sda2 done Grub is not depends on os-prober, so maybe add this? Reproducible: Always Portage 2.1.11.31 (default/linux/amd64/10.0/desktop, gcc-4.6.3, glibc-2.16.0, 3.6.8 x86_64) ================================================================= System uname: Linux-3.6.8-x86_64-Pentium-R-_Dual-Core_CPU_T4400_@_2.20GHz-with-gentoo-2.2 Timestamp of tree: Thu, 29 Nov 2012 08:30:01 +0000 ld GNU ld (GNU Binutils) 2.23.1 ccache version 3.1.8 [disabled] app-shells/bash: 4.2_p39 dev-java/java-config: 2.1.12 dev-lang/python: 2.7.3-r2, 3.2.3-r1 dev-util/ccache: 3.1.8 dev-util/cmake: 2.8.10.2 dev-util/pkgconfig: 0.27.1 sys-apps/baselayout: 2.2 sys-apps/openrc: 0.11.5 sys-apps/sandbox: 2.6 sys-devel/autoconf: 2.13, 2.69 sys-devel/automake: 1.9.6-r3, 1.11.6, 1.12.5 sys-devel/binutils: 2.23.1 sys-devel/gcc: 4.6.3 sys-devel/gcc-config: 1.8 sys-devel/libtool: 2.4.2 sys-devel/make: 3.82-r4 sys-kernel/linux-headers: 3.6 (virtual/os-headers) sys-libs/glibc: 2.16.0 Repositories: gentoo xorik xorik-link ACCEPT_KEYWORDS="amd64 ~amd64" ACCEPT_LICENSE="*" CBUILD="x86_64-pc-linux-gnu" CFLAGS="-O2 -pipe -march=native -fomit-frame-pointer" CHOST="x86_64-pc-linux-gnu" CONFIG_PROTECT="/etc /usr/share/gnupg/qualified.txt" CONFIG_PROTECT_MASK="/etc/ca-certificates.conf /etc/dconf /etc/env.d /etc/fonts/fonts.conf /etc/gconf /etc/gentoo-release /etc/php/apache2-php5.3/ext-active/ /etc/php/apache2-php5.4/ext-active/ /etc/php/cgi-php5.3/ext-active/ /etc/php/cgi-php5.4/ext-active/ /etc/php/cli-php5.3/ext-active/ /etc/php/cli-php5.4/ext-active/ /etc/revdep-rebuild /etc/sandbox.d /etc/terminfo" CXXFLAGS="-O2 -pipe -march=native -fomit-frame-pointer" DISTDIR="/usr/portage/distfiles" EMERGE_DEFAULT_OPTS="--keep-going --fail-clean=y" FCFLAGS="-O2 -pipe" FEATURES="assume-digests binpkg-logs buildpkg config-protect-if-modified distlocks ebuild-locks fail-clean fixlafiles merge-sync news parallel-fetch protect-owned sandbox sfperms strict unknown-features-warn unmerge-logs unmerge-orphans userfetch" FFLAGS="-O2 -pipe" GENTOO_MIRRORS="http://mirror.yandex.ru/gentoo-distfiles " LANG="C" LDFLAGS="-Wl,-O1 -Wl,--as-needed" LINGUAS="ru ru_RU" MAKEOPTS="-j3" PKGDIR="/usr/portage/packages" PORTAGE_CONFIGROOT="/" PORTAGE_RSYNC_OPTS="--recursive --links --safe-links --perms --times --compress --force --whole-file --delete --stats --human-readable --timeout=180 --exclude=/distfiles --exclude=/local --exclude=/packages" PORTAGE_TMPDIR="/var/tmp" PORTDIR="/usr/portage" PORTDIR_OVERLAY="/usr/local/portage/xorik /usr/local/portage/xorik-link" SYNC="rsync://rsync.gentoo.org/gentoo-portage" USE="X a52 aac acl acpi alsa amd64 automount bash-completion berkdb bluetooth branding bzip2 cairo cdda cdr cli consolekit cracklib crypt cups cxx dbus dri dts dvd dvdr emboss encode exif fam ffmpeg firefox flac fortran fuse gdbm gdu gif gimp gnome gnome-keyring gpm gtk iconv icu idn ipv6 jpeg laptop lcms libnotify mad mmx mng modules mp3 mp4 mpeg mudflap multilib natspec nautilus ncurses nls nptl ogg opengl openmp pam pango pcre pdf png policykit ppds pppd qt3support readline samba sdl session spell sse sse2 sse3 ssl startup-notification svg tcpd threads tiff truetype udev udisks unicode upnp upower usb userlocales v4l v4l2 vorbis wifi wxwidgets x264 xcb xinerama xml xorg xv xvid zlib" ALSA_CARDS="hda-intel" ALSA_PCM_PLUGINS="*" APACHE2_MODULES="authz_host dir alias mime rewrite vhost_alias auth_digest authn_file authz_groupfile dav dav_fs" CALLIGRA_FEATURES="kexi words flow plan sheets stage tables krita karbon braindump" CAMERAS="ptp2" COLLECTD_PLUGINS="df interface irq load memory rrdtool swap syslog" ELIBC="glibc" FOO2ZJS_DEVICES="hp1018" GPSD_PROTOCOLS="ashtech aivdm earthmate evermore fv18 garmin garmintxt gpsclock itrax mtk3301 nmea ntrip navcom oceanserver oldstyle oncore rtcm104v2 rtcm104v3 sirf superstar2 timing tsip tripmate tnt ubx" INPUT_DEVICES="mouse keyboard synaptics evdev joystick" KERNEL="linux" LCD_DEVICES="bayrad cfontz cfontz633 glk hd44780 lb216 lcdm001 mtxorb ncurses text" LIBREOFFICE_EXTENSIONS="presenter-console presenter-minimizer" LINGUAS="ru ru_RU" PHP_TARGETS="php5-3" PYTHON_SINGLE_TARGET="python2_7" PYTHON_TARGETS="python2_7 python3_2" RUBY_TARGETS="ruby18 ruby19" USERLAND="GNU" VIDEO_CARDS="intel i810 i915 i965" XTABLES_ADDONS="quota2 psd pknock lscan length2 ipv4options ipset ipp2p iface geoip fuzzy condition tee tarpit sysrq steal rawnat logmark ipmark dhcpmac delude chaos account" Unset: CPPFLAGS, CTARGET, INSTALL_MASK, LC_ALL, PORTAGE_BUNZIP2_COMMAND, PORTAGE_COMPRESS, PORTAGE_COMPRESS_FLAGS, PORTAGE_RSYNC_EXTRA_OPTS, USE_PYTHON
There's already a postinstall message in grub-2 mentioning the installation of os-prober: * Install sys-boot/os-prober to enable detection of other operating systems using grub2-mkconfig. IIRC the dependency on os-prober was removed because grub works without it. We usually only depend on packages that are needed to build/run the software.
