Build.log: https://bpaste.net/show/031fea3fe4bb

funtoo rj # emerge --info '=media-libs/mesa-10.5.2'
Portage 2.3.6-r9 (funtoo/1.0/linux-gnu/arch/x86-64bit, gcc-4.9.2, glibc-2.20-r2, 3.19.3-1~exp1 x86_64)
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System Settings
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System uname: Linux-3.19.3-1~exp1-x86_64-Intel-R-Core-TM-2_Duo_CPU_E4500@_2.20GHz-with-gentoo-2.2.0
KiB Mem: 4050312 total, 3002504 free
KiB Swap: 2097148 total, 2097148 free
Timestamp of tree: Unknown
ld GNU ld (Funtoo 2.25) 2.25.0
app-shells/bash: 4.3_p39-r1
dev-lang/perl: 5.22.0
dev-lang/python: 2.7.10-r1000, 3.3.6-r1000
dev-util/cmake: 3.2.3
sys-apps/baselayout: 2.2.0-r6
sys-apps/openrc: 0.12.4-r4
sys-apps/sandbox: 2.6-r2
sys-devel/autoconf: 2.13, 2.69-r1
sys-devel/automake: 1.11.6-r1, 1.12.6, 1.13.4, 1.14.1, 1.15
sys-devel/binutils: 2.25-r2
sys-devel/gcc: 4.9.2-r2
sys-devel/gcc-config: 1.8
sys-devel/libtool: 2.4.3-r2
sys-devel/make: 4.1-r1
sys-kernel/linux-headers: 4.0 (virtual/os-headers)
sys-libs/glibc: 2.20-r2
Repositories: gentoo
ACCEPT_KEYWORDS="amd64 ~amd64"
ACCEPT_LICENSE="* -@EULA Oracle-BCLA-JavaSE"
CBUILD="x86_64-pc-linux-gnu"
CFLAGS="-march=core2 -O2 -pipe"
CHOST="x86_64-pc-linux-gnu"
CONFIG_PROTECT="/etc /usr/lib64/libreoffice/program/sofficerc /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/revdep-rebuild /etc/sandbox.d /etc/terminfo"
CXXFLAGS="-march=core2 -O2 -pipe"
DISTDIR="/usr/portage/distfiles"
EMERGE_DEFAULT_OPTS="--with-bdeps=y"
FEATURES="assume-digests binpkg-logs config-protect-if-modified distlocks ebuild-locks fixlafiles merge-sync news parallel-fetch preserve-libs protect-owned sandbox sfperms strict unknown-features-warn unmerge-logs unmerge-orphans userfetch xattr"
FFLAGS="-march=core2 -O2 -pipe"
GENTOO_MIRRORS="http://distfiles.gentoo.org"
LANG="en_US.utf8"
LDFLAGS="Wl,-O1 -Wl,sort-common -Wl,-as-needed"
LINGUAS="en"
MAKEOPTS="-j3"
PKGDIR="/usr/portage/packages"
PORTAGE_CONFIGROOT="/"
PORTAGE_TMPDIR="/var/tmp"
PORTDIR="/usr/portage"
PORTDIR_OVERLAY=""
SYNC="git://github.com/funtoo/ports-2012.git"
SYNC_USER="root"
USE="X a52 aac acl alsa amd64 apng berkdb bluray bzip2 cdda cddb cdio cdr consolekit cracklib crypt cups cxx dbus dri dts dvd dvdnav dvdr dvdread encode exif faac faad ffmpeg flac gdbm gif gpm gtk ico iconv icu ieee1394 ios ipod ipv6 jpeg jpeg2k lame libass libguess libmpeg2 mad matroska mjpeg mmx modules mp3 mpeg mtp mudflap multilib ncurses nls nptl nsplugin ogg opengl openmp pam pcre pdf png policykit postproc pppd python quicktime readline resolvconf session sndfile sse sse2 ssl startup-notification svg taglib tcpd theora tiff truetype twolame udev udisks unicode upower v4l vaapi vdpau vorbis vpx wav wavpack webp win32codecs wmf x264 x265 xattr xdg xml xvid xvmc zlib" ABI_X86="64" ALSA_CARDS="ali5451 als4000 atiixp atiixp-modem bt87x ca0106 cmipci emu10k1x ens1370 ens1371 es1938 es1968 fm801 hda-intel ice1724 intel8x0 intel8x0m maestro3 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 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 authn_core authz_core socache_shmcb unixd" CALLIGRA_FEATURES="kexi words flow plan sheets stage tables krita karbon braindump author" CAMERAS="ptp2" COLLECTD_PLUGINS="df interface irq load memory rrdtool swap syslog" CPU_FLAGS_X86="mmx mmxext sse sse2 sse3 ssse3" 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 ublox ubx" GRUB_PLATFORMS="efi-64 pc" INPUT_DEVICES="evdev synaptics keyboard mouse" KERNEL="linux" LCD_DEVICES="bayrad cfontz cfontz633 glk hd44780 lb216 lcdm001 mtxorb ncurses text" LIBREOFFICE_EXTENSIONS="presenter-console presenter-minimizer" LINGUAS="en" OFFICE_IMPLEMENTATION="libreoffice" PHP_TARGETS="php5-5" PYTHON_ABIS="2.7 3.3" PYTHON_SINGLE_TARGET="python2_7" PYTHON_TARGETS="python2_7 python3_3" QEMU_SOFTMMU_TARGETS="i386 x86_64" QEMU_USER_TARGETS="i386 x86_64" RUBY_TARGETS="ruby19 ruby20 ruby21 ruby22" USERLAND="GNU" VIDEO_CARDS="nouveau radeon fglrx" 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, SYNC_UMASK

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Package Settings
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media-libs/mesa-10.5.2 was built with the following:
USE="classic dri3 egl gallium gbm llvm nptl udev vaapi vdpau xa xvmc -bindist -d3d9 -debug -gles1 -gles2 -opencl -openmax -osmesa -pax_kernel -pic (-selinux) -wayland" ABI_X86="64 -32 -x32" VIDEO_CARDS="nouveau radeon -freedreno -i915 -i965 -ilo -intel -r100 -r200 -r300 -r600 -radeonsi -vmware"

funtoo rj # emerge -pqv '=media-libs/mesa-10.5.2'
[ebuild R ] media-libs/mesa-10.5.2 USE="classic dri3 egl gallium gbm llvm nptl udev vaapi vdpau xa xvmc -bindist -d3d9 -debug -gles1 -gles2 -opencl -openmax -osmesa -pax_kernel -pic (-selinux) -wayland" ABI_X86="(64) -32 (-x32)" VIDEO_CARDS="nouveau radeon (-freedreno) -i915 -i965 -ilo -intel -r100 -r200 -r300 -r600 -radeonsi -vmware"