emerge --info '=dev-cpp/gtkmm-2.24.4-r2::gentoo'

Portage 2.2.25 (python 2.7.10-final-0, default/linux/amd64/13.0/desktop, gcc-4.9.3, glibc-2.22-r1, 4.1.12-gentoo x86_64)
=================================================================
                         System Settings
=================================================================
System uname: Linux-4.1.12-gentoo-x86_64-Intel-R-_Core-TM-_i5-3570K_CPU_@_3.40GHz-with-gentoo-2.2
KiB Mem:    24650236 total,  20162348 free
KiB Swap:    2097148 total,   2097148 free
Timestamp of repository gentoo: Tue, 24 Nov 2015 20:00:01 +0000
sh bash 4.3_p42
ld GNU ld (Gentoo 2.25.1 p1.1) 2.25.1
app-shells/bash:          4.3_p42::gentoo
dev-lang/perl:            5.22.0::gentoo
dev-lang/python:          2.7.10-r3::gentoo, 3.4.3-r2::gentoo
dev-util/cmake:           3.4.0-r1::gentoo
dev-util/pkgconfig:       0.29::gentoo
sys-apps/baselayout:      2.2::gentoo
sys-apps/openrc:          0.18.3::gentoo
sys-apps/sandbox:         2.9::gentoo
sys-devel/autoconf:       2.13::gentoo, 2.69-r1::gentoo
sys-devel/automake:       1.11.6-r1::gentoo, 1.13.4::gentoo, 1.14.1::gentoo, 1.15::gentoo
sys-devel/binutils:       2.25.1-r1::gentoo
sys-devel/gcc:            4.9.3::gentoo
sys-devel/gcc-config:     1.8::gentoo
sys-devel/libtool:        2.4.6-r1::gentoo
sys-devel/make:           4.1-r1::gentoo
sys-kernel/linux-headers: 4.3::gentoo (virtual/os-headers)
sys-libs/glibc:           2.22-r1::gentoo
Repositories:

gentoo
    location: /usr/portage
    sync-type: rsync
    sync-uri: rsync://rsync.gentoo.org/gentoo-portage
    priority: -1000

abendbrot
    location: /var/lib/layman/abendbrot
    masters: gentoo
    priority: 50

gamerlay
    location: /var/lib/layman/gamerlay
    masters: gentoo
    priority: 50

lxde-gtk3
    location: /var/lib/layman/lxde-gtk3
    masters: gentoo
    priority: 50

palemoon
    location: /var/lib/layman/palemoon
    masters: gentoo
    priority: 50

sabayon
    location: /var/lib/layman/sabayon
    masters: gentoo
    priority: 50

ACCEPT_KEYWORDS="amd64"
ACCEPT_LICENSE="* -@EULA"
CBUILD="x86_64-pc-linux-gnu"
CFLAGS="-march=native -O2 -pipe"
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/revdep-rebuild /etc/sandbox.d /etc/terminfo"
CXXFLAGS="-march=native -O2 -pipe"
DISTDIR="/usr/portage/distfiles"
FCFLAGS="-O2 -pipe"
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 userpriv usersandbox usersync xattr"
FFLAGS="-O2 -pipe"
GENTOO_MIRRORS="http://distfiles.gentoo.org"
LANG="en_US.utf8"
LDFLAGS="-Wl,-O1 -Wl,--as-needed"
MAKEOPTS="-j5"
PKGDIR="/usr/portage/packages"
PORTAGE_CONFIGROOT="/"
PORTAGE_RSYNC_OPTS="--recursive --links --safe-links --perms --times --omit-dir-times --compress --force --whole-file --delete --stats --human-readable --timeout=180 --exclude=/distfiles --exclude=/local --exclude=/packages"
PORTAGE_TMPDIR="/var/tmp"
USE="X a52 aac acl acpi aes alsa amd64 berkdb bindist bluetooth branding bzip2 cairo cdda cdr cli consolekit cracklib crypt cups cxx dbus dri dts dvd dvdr emboss encode exif fam firefox flac fortran gdbm gif glamor gpm gtk iconv ipv6 jpeg lcms ldap libnotify mad mmx mmxext mng modules mp3 mp4 mpeg multilib ncurses nls nptl ogg opengl openmp pam pango pclmul pcre pdf png policykit popcnt ppds pulseaudio qt3support qt4 readline sdl seccomp session spell sse sse2 sse3 sse4_1 sse4_2 ssl ssse3 startup-notification svg tcpd tiff truetype udev udisks unicode upower usb vorbis wxwidgets x264 xattr xcb xml xv xvid zlib" ABI_X86="64 32" ALSA_CARDS="ali5451 als4000 atiixp atiixp-modem bt87x ca0106 cmipci emu10k1x ens1370 ens1371 es1938 es1968 fm801 hda-intel intel8x0 intel8x0m maestro3 trident usb-audio via82xx via82xx-modem ymfpci" APACHE2_MODULES="authn_core authz_core socache_shmcb unixd 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 author" CAMERAS="ptp2" COLLECTD_PLUGINS="df interface irq load memory rrdtool swap syslog" CPU_FLAGS_X86="aes avx mmx mmxext popcnt sse sse2 sse3 sse4_1 sse4_2 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" INPUT_DEVICES="evdev" KERNEL="linux" LCD_DEVICES="bayrad cfontz cfontz633 glk hd44780 lb216 lcdm001 mtxorb ncurses text" LIBREOFFICE_EXTENSIONS="presenter-console presenter-minimizer" OFFICE_IMPLEMENTATION="libreoffice" PHP_TARGETS="php5-5" PYTHON_SINGLE_TARGET="python2_7" PYTHON_TARGETS="python2_7 python3_4" RUBY_TARGETS="ruby20 ruby21" USERLAND="GNU" VIDEO_CARDS="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:  CC, CPPFLAGS, CTARGET, CXX, EMERGE_DEFAULT_OPTS, INSTALL_MASK, LC_ALL, PORTAGE_BUNZIP2_COMMAND, PORTAGE_COMPRESS, PORTAGE_COMPRESS_FLAGS, PORTAGE_RSYNC_EXTRA_OPTS, USE_PYTHON