I was asked to file a bug here :)
https://bugs.gentoo.org/show_bug.cgi?id=425096


CC     libfarstream_0.1_la-fs-rtp.lo
/bin/sh ../libtool --silent --tag=CC   --mode=compile x86_64-pc-linux-gnu-gcc -DHAVE_CONFIG_H -I. -I..    -I.. -I.. -pthread -I/usr/include/gstreamer-0.10 -I/usr/include/glib-2.0 -I/usr/lib64/glib-2.0/include -I/usr/include/libxml2   -Wall -Wdeclaration-after-statement -Wvla -Wpointer-arith   -g   -pthread -I/usr/include/gstreamer-0.10 -I/usr/include/glib-2.0 -I/usr/lib64/glib-2.0/include -I/usr/include/libxml2   -pthread -I/usr/include/gstreamer-0.10 -I/usr/include/glib-2.0 -I/usr/lib64/glib-2.0/include -I/usr/include/libxml2   -pthread -I/usr/include/gstreamer-0.10 -I/usr/include/glib-2.0 -I/usr/lib64/glib-2.0/include -I/usr/include/libxml2   -O2 -pipe -march=corei7 -mcx16 -msahf -mno-movbe -mno-aes -mno-pclmul -mpopcnt -mno-abm -mno-lwp -mno-fma -mno-fma4 -mno-xop -mno-bmi -mno-bmi2 -mno-tbm -mno-avx -mno-avx2 -msse4.2 -msse4.1 -mno-lzcnt -mno-rdrnd -mno-f16c -mno-fsgsbase --param l1-cache-size=32 --param l1-cache-line-size=64 --param l2-cache-size=8192 -mtune=corei7 -c -o libfarstream_0.1_la-fs-rtp.lo `test -f 'fs-rtp.c' || echo './'`fs-rtp.c
  CC     libfarstream_0.1_la-fs-marshal.lo
/bin/sh ../libtool --silent --tag=CC   --mode=compile x86_64-pc-linux-gnu-gcc -DHAVE_CONFIG_H -I. -I..    -I.. -I.. -pthread -I/usr/include/gstreamer-0.10 -I/usr/include/glib-2.0 -I/usr/lib64/glib-2.0/include -I/usr/include/libxml2   -Wall -Wdeclaration-after-statement -Wvla -Wpointer-arith   -g   -pthread -I/usr/include/gstreamer-0.10 -I/usr/include/glib-2.0 -I/usr/lib64/glib-2.0/include -I/usr/include/libxml2   -pthread -I/usr/include/gstreamer-0.10 -I/usr/include/glib-2.0 -I/usr/lib64/glib-2.0/include -I/usr/include/libxml2   -pthread -I/usr/include/gstreamer-0.10 -I/usr/include/glib-2.0 -I/usr/lib64/glib-2.0/include -I/usr/include/libxml2   -O2 -pipe -march=corei7 -mcx16 -msahf -mno-movbe -mno-aes -mno-pclmul -mpopcnt -mno-abm -mno-lwp -mno-fma -mno-fma4 -mno-xop -mno-bmi -mno-bmi2 -mno-tbm -mno-avx -mno-avx2 -msse4.2 -msse4.1 -mno-lzcnt -mno-rdrnd -mno-f16c -mno-fsgsbase --param l1-cache-size=32 --param l1-cache-line-size=64 --param l2-cache-size=8192 -mtune=corei7 -c -o libfarstream_0.1_la-fs-marshal.lo `test -f 'fs-marshal.c' || echo './'`fs-marshal.c
  CC     libfarstream_0.1_la-fs-enumtypes.lo
/bin/sh ../libtool --silent --tag=CC   --mode=compile x86_64-pc-linux-gnu-gcc -DHAVE_CONFIG_H -I. -I..    -I.. -I.. -pthread -I/usr/include/gstreamer-0.10 -I/usr/include/glib-2.0 -I/usr/lib64/glib-2.0/include -I/usr/include/libxml2   -Wall -Wdeclaration-after-statement -Wvla -Wpointer-arith   -g   -pthread -I/usr/include/gstreamer-0.10 -I/usr/include/glib-2.0 -I/usr/lib64/glib-2.0/include -I/usr/include/libxml2   -pthread -I/usr/include/gstreamer-0.10 -I/usr/include/glib-2.0 -I/usr/lib64/glib-2.0/include -I/usr/include/libxml2   -pthread -I/usr/include/gstreamer-0.10 -I/usr/include/glib-2.0 -I/usr/lib64/glib-2.0/include -I/usr/include/libxml2   -O2 -pipe -march=corei7 -mcx16 -msahf -mno-movbe -mno-aes -mno-pclmul -mpopcnt -mno-abm -mno-lwp -mno-fma -mno-fma4 -mno-xop -mno-bmi -mno-bmi2 -mno-tbm -mno-avx -mno-avx2 -msse4.2 -msse4.1 -mno-lzcnt -mno-rdrnd -mno-f16c -mno-fsgsbase --param l1-cache-size=32 --param l1-cache-line-size=64 --param l2-cache-size=8192 -mtune=corei7 -c -o libfarstream_0.1_la-fs-enumtypes.lo `test -f 'fs-enumtypes.c' || echo './'`fs-enumtypes.c
  GISCAN Farstream-0.1.gir
  CCLD   libfarstream-0.1.la
g-ir-scanner: Farstream: warning: 31 warnings suppressed (use --warn-all to see them)
  GICOMP Farstream-0.1.gir

** (g-ir-compiler:26733): WARNING **: Unknown transfer-ownership value: 'full  This is the current preferences list for the local codecs. It is set by the user to specify the codec options and priorities. The user may change its value with fs_session_set_codec_preferences() at any time during a session. It is a #GList of #FsCodec. The user must free this codec list using fs_codec_list_destroy() when done.  The payload type may be a valid dynamic PT (96-127), %FS_CODEC_ID_DISABLE or %FS_CODEC_ID_ANY. If the encoding name is "reserve-pt", then the payload type of the codec will be "reserved" and not be used by any dynamically assigned payload type.' for property 'codec-preferences' in type 'Farstream.Session'
/bin/sh: line 1: 26733 Pułapka debuggera/breakpoint     /usr/bin/g-ir-compiler --includedir=. Farstream-0.1.gir -o Farstream-0.1.typelib
make[3]: *** [Farstream-0.1.typelib] Błąd 133
make[3]: Opuszczenie katalogu `/var/tmp/portage/net-libs/farstream-0.1.2-r1/work/farstream-0.1.2/farstream'
make[2]: *** [all] Błąd 2
make[2]: Opuszczenie katalogu `/var/tmp/portage/net-libs/farstream-0.1.2-r1/work/farstream-0.1.2/farstream'
make[1]: *** [all-recursive] Błąd 1
make[1]: Opuszczenie katalogu `/var/tmp/portage/net-libs/farstream-0.1.2-r1/work/farstream-0.1.2'
make: *** [all] Błąd 2
 * ERROR: net-libs/farstream-0.1.2-r1 failed (compile phase):
 *   emake failed






Portage 2.1.11.5 (default/linux/amd64/10.0/desktop/gnome, gcc-4.7.1, glibc-2.15-r2, 3.5.0-rc5 x86_64)
=================================================================
System uname: Linux-3.5.0-rc5-x86_64-Intel-R-_Core-TM-_i7_CPU_Q_840_@_1.87GHz-with-gentoo-2.1
Timestamp of tree: Fri, 06 Jul 2012 05:00:01 +0000
distcc 3.1 x86_64-pc-linux-gnu [enabled]
app-shells/bash:          4.2_p29
dev-java/java-config:     2.1.12
dev-lang/python:          2.7.3-r2, 3.2.3-r1
dev-util/cmake:           2.8.8-r3
dev-util/pkgconfig:       0.26
sys-apps/baselayout:      2.1-r1
sys-apps/openrc:          0.10.5
sys-apps/sandbox:         2.6
sys-devel/autoconf:       2.13, 2.69
sys-devel/automake:       1.10.3, 1.11.5, 1.12.1
sys-devel/binutils:       2.22-r1
sys-devel/gcc:            4.6.3, 4.7.1
sys-devel/gcc-config:     1.7.3
sys-devel/libtool:        2.4.2
sys-devel/make:           3.82-r3
sys-kernel/linux-headers: 3.4 (virtual/os-headers)
sys-libs/glibc:           2.15-r2
Repositories: gentoo lcd-filtering mv systemd xarthisius gnome x-portage
ACCEPT_KEYWORDS="amd64 ~amd64"
ACCEPT_LICENSE="* @EULA"
CBUILD="x86_64-pc-linux-gnu"
CFLAGS="-O2 -pipe -march=corei7 -mcx16 -msahf -mno-movbe -mno-aes -mno-pclmul -mpopcnt -mno-abm -mno-lwp -mno-fma -mno-fma4 -mno-xop -mno-bmi -mno-bmi2 -mno-tbm -mno-avx -mno-avx2 -msse4.2 -msse4.1 -mno-lzcnt -mno-rdrnd -mno-f16c -mno-fsgsbase --param l1-cache-size=32 --param l1-cache-line-size=64 --param l2-cache-size=8192 -mtune=corei7"
CHOST="x86_64-pc-linux-gnu"
CONFIG_PROTECT="/etc /usr/share/gnupg/qualified.txt"
CONFIG_PROTECT_MASK="${EPREFIX}/etc/gconf /etc/ca-certificates.conf /etc/dconf /etc/env.d /etc/fonts/fonts.conf /etc/gconf /etc/gentoo-release /etc/revdep-rebuild /etc/sandbox.d /etc/splash /etc/terminfo /etc/texmf/language.dat.d /etc/texmf/language.def.d /etc/texmf/updmap.d /etc/texmf/web2c"
CXXFLAGS="-O2 -pipe -march=corei7 -mcx16 -msahf -mno-movbe -mno-aes -mno-pclmul -mpopcnt -mno-abm -mno-lwp -mno-fma -mno-fma4 -mno-xop -mno-bmi -mno-bmi2 -mno-tbm -mno-avx -mno-avx2 -msse4.2 -msse4.1 -mno-lzcnt -mno-rdrnd -mno-f16c -mno-fsgsbase --param l1-cache-size=32 --param l1-cache-line-size=64 --param l2-cache-size=8192 -mtune=corei7"
DISTDIR="/usr/portage/distfiles"
FCFLAGS="-O2 -pipe"
FEATURES="assume-digests binpkg-logs config-protect-if-modified distcc distlocks ebuild-locks fixlafiles news parallel-fetch parse-eapi-ebuild-head protect-owned sandbox sfperms strict unknown-features-warn unmerge-logs unmerge-orphans userfetch"
FFLAGS="-O2 -pipe"
GENTOO_MIRRORS="gentoo.prz.rzeszow.pl"
LANG="pl_PL.utf8"
LC_ALL="pl_PL.utf8"
LDFLAGS="-Wl,-O1 -Wl,--as-needed"
LINGUAS="pl en"
MAKEOPTS="-j8"
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="/var/lib/layman/lcd-filtering /var/lib/layman/mv /var/lib/layman/systemd /var/lib/layman/xarthisius /var/lib/layman/gnome /usr/local/portage"
SYNC="rsync://rsync.gentoo.org/gentoo-portage"
USE="X a52 aac acl acpi alsa amd64 archive artworkextra avahi bluetooth bluray branding bzip2 cairo cdda cdr cli consolekit cracklib crypt cryptsetup cups cxx dbus djvu dri dts dvd dvdr edit eds emboss encode evo exif extra fam fbcon ffmpeg firefox flac fontconfig g3dvl games gbm gd gdu gif git glchess gmp gnome gnome-keyring gnome-online-accounts gnutls gpm graphics graphite gs gstreamer gtk gtk3 humanities iconv icu imagemagick ithreads jabber java jpeg jpeg2k justify lame lcdfilter lcms libnotify libsamplerate lzma lzo mad mmx mmxext mng modemmanager modules mono mp3 mp4 mpeg mudflap multilib nautilus ncurses networkmanager nls nptl nsplugin ntp ogg openal opengl openmp pam pango pcap pcre pdf perl png policykit ppds pppd publishers pulseaudio python3 qemu rdesktop readline samba science sdl session shared-dricore slang smp socialweb spell spice sqlite sse sse2 sse3 sse4_1 sse4_2 ssl ssse3 startup-notification svg symlink t1lib taglib tcpd threads tiff truetype udev udisks unicode upower usb vaapi vala virt-network vorbis wavpack wifi wxwidgets x264 xa xcb xcomposite xindy xinerama xml xorg xpm xv xvfb xvid xvmc zlib" 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 cgi cgid 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" CALLIGRA_FEATURES="kexi words flow plan sheets stage tables krita karbon braindump" CAMERAS="ptp2" COLLECTD_PLUGINS="df interface irq load memory rrdtool swap syslog" CURL_SSL="gnutls" ELIBC="glibc" 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" GRUB_PLATFORMS="pc" INPUT_DEVICES="evdev keyboard mouse synaptics" KERNEL="linux" LCD_DEVICES="bayrad cfontz cfontz633 glk hd44780 lb216 lcdm001 mtxorb ncurses text" LIBREOFFICE_EXTENSIONS="presenter-console presenter-minimizer" LINGUAS="pl en" PHP_TARGETS="php5-3" PYTHON_TARGETS="python3_2 python2_7" QEMU_SOFTMMU_TARGETS="x86_64 i386" QEMU_USER_TARGETS="x86_64 i386" RUBY_TARGETS="ruby18 ruby19" USERLAND="GNU" VIDEO_CARDS="vesa radeon r600" 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, EMERGE_DEFAULT_OPTS, INSTALL_MASK, PORTAGE_BUNZIP2_COMMAND, PORTAGE_COMPRESS, PORTAGE_COMPRESS_FLAGS, PORTAGE_RSYNC_EXTRA_OPTS, USE_PYTHON