* =sys-libs/glibc-2.10.1
    gentoo:                  2.10.1(~)* {:2.2} 
    HOMEPAGE:                http://www.gnu.org/software/libc/libc.html
    DESCRIPTION:             GNU libc6 (also called glibc2) C library
    herds:                   toolchain
    PALUDIS_CHOICES:         
        USE:                     -debug gd -glibc-omitfp (-hardened) (multilib) nls -profile (-selinux) -vanilla
        ARCH:                    (-alpha) (amd64) (-amd64-fbsd) (-arm) (-hppa) (-ia64) (-m68k) (-mips) (-ppc) (-ppc64) (-s390) (-sh) (-sparc) (-sparc-fbsd) (-x86) (-x86-fbsd)
        ALSA_CARDS:              ali5451 als4000 atiixp atiixp-modem bt87x ca0106 cmipci emu10k1x ens1370 ens1371 es1938 es1968 fm801 hda-intel hdsp intel8x0 intel8x0m maestro3 mpu401 trident usb-audio via82xx via82xx-modem ymfpci
        ALSA_PCM_PLUGINS:        adpcm alaw asym copy dmix dshare dsnoop empty extplug file hooks iec958 ioplug ladspa lfloat linear meter mmap_emul mulaw multi null plug rate route share shm softvol
        APACHE2_MODULES:         actions alias auth_basic authn_alias authn_anon authn_dbm authn_default authn_file authz_dbm authz_default authz_groupfile authz_host authz_owner authz_user autoindex cache dav dav_fs dav_lock deflate dir disk_cache env expires ext_filter file_cache filter headers include info log_config logio mem_cache mime mime_magic negotiation rewrite setenvif speling status unique_id userdir usertrack vhost_alias
        APACHE2_MPMS:            
        CAMERAS:                 directory ptp2 sonix spca50x template
        CROSSCOMPILE_OPTS:       -headers-only
        DVB_CARDS:               
        ELIBC:                   (glibc)
        FCDSL_CARDS:             
        FOO2ZJS_DEVICES:         
        FRITZCAPI_CARDS:         
        INPUT_DEVICES:           evdev keyboard mouse synaptics wacom
        KERNEL:                  (linux)
        LCD_DEVICES:             bayrad cfontz cfontz633 glk hd44780 lb216 lcdm001 mtxorb ncurses text
        LINGUAS:                 en en_GB en_NZ en_US
        LIRC_DEVICES:            
        MISDN_CARDS:             
        NETBEANS_MODULES:        
        QEMU_SOFTMMU_TARGETS:    
        QEMU_USER_TARGETS:       
        USERLAND:                (GNU)
        VIDEO_CARDS:             -dummy fbdev -glint -i810 -intel -mach64 -mga -neomagic nv nvidia -r128 -radeon -savage -sis -tdfx -trident -v4l vesa vga -via -vmware -voodoo
        build_options:           optional_tests
    DEPEND:                  >=sys-devel/gcc-3.4.4 arm? ( >=sys-devel/binutils-2.16.90 >=sys-devel/gcc-4.1.0 ) ppc? ( >=sys-devel/gcc-4.1.0 ) ppc64? ( >=sys-devel/gcc-4.1.0 ) >=sys-devel/binutils-2.15.94 >=sys-kernel/linux-headers-2.6.9 >=sys-devel/gcc-config-1.3.12 >=app-misc/pax-utils-0.1.10 virtual/os-headers nls? ( sys-devel/gettext ) >=sys-apps/sandbox-1.2.18.1-r2 >=sys-apps/portage-2.1.2 selinux? ( sys-libs/libselinux ) >=sys-libs/timezone-data-2007c sys-devel/gnuconfig
    RDEPEND:                 nls? ( sys-devel/gettext ) selinux? ( sys-libs/libselinux ) sys-libs/timezone-data
    SRC_URI:                 mirror://gnu/glibc/glibc-2.10.1.tar.bz2 ftp://sources.redhat.com/pub/glibc/releases/glibc-2.10.1.tar.bz2 ftp://sources.redhat.com/pub/glibc/snapshots/glibc-2.10.1.tar.bz2 mirror://gentoo/glibc-2.10.1.tar.bz2 mirror://gnu/glibc/glibc-libidn-2.10.1.tar.bz2 ftp://sources.redhat.com/pub/glibc/releases/glibc-libidn-2.10.1.tar.bz2 ftp://sources.redhat.com/pub/glibc/snapshots/glibc-libidn-2.10.1.tar.bz2 mirror://gentoo/glibc-libidn-2.10.1.tar.bz2 mirror://gentoo/glibc-2.10.1-patches-1.tar.bz2 http://dev.gentoo.org/~vapier/dist/glibc-2.10.1-patches-1.tar.bz2 http://dev.gentoo.org/~azarah/glibc/glibc-2.10.1-patches-1.tar.bz2
    PDEPEND:                 
    PROVIDE:                 virtual/libc
    EBUILD:                  /usr/portage/sys-libs/glibc/glibc-2.10.1.ebuild
    SLOT:                    2.2
    RESTRICT:                strip
    PROPERTIES:              
    LICENSE:                 LGPL-2
    KEYWORDS:                ~amd64 ~x86
    INHERITED:               eutils flag-o-matic gnuconfig libtool multilib portability toolchain-funcs versionator
    DEFINED_PHASES:          compile install postinst preinst setup test unpack
    IUSE:                    crosscompile_opts_headers-only debug gd glibc-omitfp hardened multilib nls profile selinux vanilla
    EAPI:                    0

Key to mask reasons:

* ~: keyword (unstable accepted)