emerge --info
Portage 2.3.51 (python 3.6.5-final-0, default/linux/amd64/17.0, gcc-7.3.0, glibc-2.27-r6, 4.12.12-gentoo x86_64)
=================================================================
System uname: Linux-4.12.12-gentoo-x86_64-Intel-R-_Xeon-R-_CPU_E5-2407_0_@_2.20GHz-with-gentoo-2.6
KiB Mem:     8179964 total,   5182944 free
KiB Swap:    1953788 total,   1953788 free
Timestamp of repository gentoo: Wed, 21 Nov 2018 18:30:01 +0000
Head commit of repository gentoo: 6b095f9417bc801afa6683b1aa04bb0d0d53dce9
sh bash 4.4_p12
ld GNU ld (Gentoo 2.30 p5) 2.30.0
distcc 3.2rc1 x86_64-pc-linux-gnu [disabled]
app-shells/bash:          4.4_p12::gentoo
dev-lang/perl:            5.24.3-r1::gentoo
dev-lang/python:          2.7.15::gentoo, 3.4.8::gentoo, 3.5.5::gentoo, 3.6.5::gentoo
dev-util/cmake:           3.9.6::gentoo
dev-util/pkgconfig:       0.29.2::gentoo
sys-apps/baselayout:      2.6-r1::gentoo
sys-apps/openrc:          0.38.3::gentoo
sys-apps/sandbox:         2.13::gentoo
sys-devel/autoconf:       2.69-r4::gentoo
sys-devel/automake:       1.13.4::gentoo, 1.15.1-r2::gentoo
sys-devel/binutils:       2.28.1::gentoo, 2.30-r4::gentoo
sys-devel/gcc:            5.4.0-r3::gentoo, 7.3.0-r3::gentoo
sys-devel/gcc-config:     1.8-r1::gentoo
sys-devel/libtool:        2.4.6-r3::gentoo
sys-devel/make:           4.2.1-r4::gentoo
sys-kernel/linux-headers: 4.13::gentoo (virtual/os-headers)
sys-libs/glibc:           2.27-r6::gentoo
Repositories:

x-portage
    location: /usr/local/portage
    masters: gentoo
    priority: 0

gentoo
    location: /usr/portage
    sync-type: rsync
    sync-uri: rsync://rsync.gentoo.org/gentoo-portage
    priority: 1
    sync-rsync-verify-jobs: 1
    sync-rsync-extra-opts:
    sync-rsync-verify-metamanifest: yes
    sync-rsync-verify-max-age: 24

ACCEPT_KEYWORDS="amd64"
ACCEPT_LICENSE="* -@EULA"
CBUILD="x86_64-pc-linux-gnu"
CFLAGS="-O2 -march=corei7-avx -pipe"
CHOST="x86_64-pc-linux-gnu"
CONFIG_PROTECT="/etc /usr/share/gnupg/qualified.txt /var/bind"
CONFIG_PROTECT_MASK="/etc/ca-certificates.conf /etc/env.d /etc/fonts/fonts.conf /etc/gconf /etc/gentoo-release /etc/php/apache2-php7.0/ext-active/ /etc/php/apache2-php7.2/ext-active/ /etc/php/cgi-php7.0/ext-active/ /etc/php/cgi-php7.2/ext-active/ /etc/php/cli-php7.0/ext-active/ /etc/php/cli-php7.2/ext-active/ /etc/revdep-rebuild /etc/sandbox.d /etc/terminfo"
CXXFLAGS="-O2 -march=corei7-avx -pipe"
DISTDIR="/usr/portage/distfiles"
ENV_UNSET="DBUS_SESSION_BUS_ADDRESS DISPLAY GOBIN PERL5LIB PERL5OPT PERLPREFIX PERL_CORE PERL_MB_OPT PERL_MM_OPT XAUTHORITY XDG_CACHE_HOME XDG_CONFIG_HOME XDG_DATA_HOME XDG_RUNTIME_DIR"
FCFLAGS="-O2 -pipe"
FEATURES="assume-digests binpkg-logs buildpkg candy config-protect-if-modified distlocks ebuild-locks fixlafiles merge-sync multilib-strict 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 ftp://mirror.pacific.net.au/linux/Gentoo http://mirror.isp.net.au/pub/gentoo/ ftp://ftp.swin.edu.au/gentoo http://ftp.swin.edu.au/gentoo http://mirror.gentoo.gr.jp http://gentoo.gg3.net/ ftp://gg3.net/pub/linux/gentoo/ http://gentoo.channelx.biz/ http://gentoo.scphost.com ftp://gentoo.mirrors.scphost.com/pub/mirrors/gentoo/ http://ftp.isu.edu.tw/pub/Linux/Gentoo ftp://ftp.isu.edu.tw/pub/Linux/Gentoo http://ftp.twaren.net/Linux/Gentoo/ ftp://ftp.twaren.net/Linux/Gentoo"
LANG="en_US.utf8"
LDFLAGS="-Wl,-O1 -Wl,--as-needed"
LINGUAS="en zh_TW"
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 --exclude=/.git"
PORTAGE_TMPDIR="/var/tmp"
USE="acl ads amd64 apache2 bash-completion berkdb bzip2 cjk cli crypt cups curl cxx dri fam fortran gd gdbm gif gpm gssapi iconv imagemagick imap iodbc ipv6 javascript jpeg kerberos ldap libedit libtirpc logrotate mad maildir mbox memlimit mhash mime multilib ncurses nls nptl objc odbc ogg openmp pam pcre perl png posix python samba sasl seccomp slp sockets ssl tcpd threads udev unicode usb vhosts xattr xml xmlrpc zlib" ABI_X86="64" 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="actions alias auth_basic auth_digest authn_anon authn_core authn_dbd authn_dbm authn_default authn_file authz_core authz_dbm authz_default authz_groupfile authz_host authz_owner authz_user autoindex cache cgi dav dav_fs dav_lock dbd deflate dir disk_cache env expires ext_filter file_cache filter headers ident imagemap include info log_config logio mem_cache mime mime_magic negotiation proxy proxy_ajp proxy_balancer proxy_connect proxy_http rewrite setenvif so socache_shmcb speling status slotmem_shm unique_id userdir usertrack vhost_alias" APACHE2_MPMS="worker" CALLIGRA_FEATURES="karbon plan sheets stage words" COLLECTD_PLUGINS="df interface irq load memory rrdtool swap syslog" CPU_FLAGS_X86="mmx mmxext sse sse2" ELIBC="glibc" GPSD_PROTOCOLS="ashtech aivdm earthmate evermore fv18 garmin garmintxt gpsclock isync itrax mtk3301 nmea ntrip navcom oceanserver oldstyle oncore rtcm104v2 rtcm104v3 sirf skytraq superstar2 timing tsip tripmate tnt ublox ubx" INPUT_DEVICES="libinput keyboard mouse" 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="php5-3 php7" POSTGRES_TARGETS="postgres9_5 postgres10" PYTHON_SINGLE_TARGET="python2_7" PYTHON_TARGETS="python2_7 python3_5 python3_6" RUBY_TARGETS="ruby23 ruby24" USERLAND="GNU" VIDEO_CARDS="amdgpu fbdev intel nouveau radeon radeonsi vesa dummy v4l" 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_BINHOST, PORTAGE_BUNZIP2_COMMAND, PORTAGE_COMPRESS, PORTAGE_COMPRESS_FLAGS, PORTAGE_RSYNC_EXTRA_OPTS