The result of 'emerge --info' in my system.

emerge_info (text/plain), 6.63 KB, created by Seong-ho Cho on 2019-03-14 00:31:46 UTC

Portage 2.3.62 (python 3.6.8-final-0, default/linux/amd64/17.0, gcc-8.2.0, glibc-2.28-r5, 4.20.5-gentoo x86_64)
=================================================================
System uname: Linux-4.20.5-gentoo-x86_64-Intel-R-_Core-TM-_i3-2120_CPU_@_3.30GHz-with-gentoo-2.6
KiB Mem:     3958284 total,   1198928 free
KiB Swap:    8388604 total,   8133116 free
Head commit of repository gentoo: 31c76bd73f15e38afd5ac189231e8678fe491de5

sh bash 5.0_p2-r2
ld GNU ld (Gentoo 2.30 p5) 2.30.0
app-shells/bash:          5.0_p2-r2::gentoo
dev-java/java-config:     2.2.0-r4::gentoo
dev-lang/perl:            5.28.0::gentoo
dev-lang/python:          2.7.16::gentoo, 3.6.8::gentoo
dev-util/cmake:           3.13.4::gentoo
dev-util/pkgconfig:       0.29.2::gentoo
sys-apps/baselayout:      2.6-r1::gentoo
sys-apps/openrc:          0.41.2::gentoo
sys-apps/sandbox:         2.15::gentoo
sys-devel/autoconf:       2.13-r1::gentoo, 2.69-r4::gentoo
sys-devel/automake:       1.16.1-r1::gentoo
sys-devel/binutils:       2.30-r4::gentoo, 2.31.1-r4::gentoo, 2.32::gentoo
sys-devel/gcc:            8.2.0-r6::gentoo, 8.3.0::gentoo
sys-devel/gcc-config:     2.0::gentoo
sys-devel/libtool:        2.4.6-r5::gentoo
sys-devel/make:           4.2.1-r4::gentoo
sys-kernel/linux-headers: 5.0-r1::gentoo (virtual/os-headers)
sys-libs/glibc:           2.28-r5::gentoo
Repositories:

gentoo
    location: /usr/portage
    sync-type: git
    sync-uri: git://github.com/gentoo/gentoo.git
    priority: -1000

ACCEPT_KEYWORDS="amd64 ~amd64"
ACCEPT_LICENSE="*"
CBUILD="x86_64-pc-linux-gnu"
CFLAGS="-O2 -pipe -march=sandybridge -mtune=generic -mno-aes"
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/php/apache2-php7.2/ext-active/ /etc/php/apache2-php7.3/ext-active/ /etc/php/cgi-php7.2/ext-active/ /etc/php/cgi-php7.3/ext-active/ /etc/php/cli-php7.2/ext-active/ /etc/php/cli-php7.3/ext-active/ /etc/revdep-rebuild /etc/sandbox.d /etc/terminfo /etc/texmf/language.dat.d /etc/texmf/language.def.d /etc/texmf/updmap.d /etc/texmf/web2c"
CXXFLAGS="-O2 -pipe -march=sandybridge -mtune=generic -mno-aes"
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 -march=sandybridge -mtune=generic -mno-aes"
FEATURES="assume-digests binpkg-docompress binpkg-dostrip binpkg-logs config-protect-if-modified distlocks ebuild-locks fixlafiles ipc-sandbox merge-sync multilib-strict network-sandbox news nostrip parallel-fetch pid-sandbox preserve-libs protect-owned sfperms splitdebug strict unknown-features-warn unmerge-logs unmerge-orphans userfetch userpriv usersync xattr"
FFLAGS="-O2 -pipe -march=sandybridge -mtune=generic -mno-aes"
GENTOO_MIRRORS="http://distfiles.gentoo.org"
LANG="ko_KR.utf8"
LDFLAGS="-Wl,-O1 -Wl,--as-needed"
LINGUAS="ko"
MAKEOPTS="-j5 -l8"
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="64-bit-bfd X acl alsa amd64 apache2 apng appindicator argon2 bcmath berkdb bluetooth branding broadway bzip2 c++11 calendar cjk clang cli colord coverage cpudetection crypt cscope curl cxx dbus deprecated dri evdev exif expat extra-tools ffmpeg fontforge fortran fpm gcrypt gd gdbm geckodriver gif glib gmp gnutls gold gpg gpm graphviz gtk gtk3 harfbuzz highlight hwaccel iconv icu idn intl iodbc ipv6 ithreads jpeg json kerberos latex ldap ldapdb libass libevent libkms libsamplate libsoxr libtirpc libv4l lua lzma lzo modplug mp3 mssql multilib multitarget mysqli ncurses net nettle nls nptl nss ogg openal openldap openmp pam pbkdf2 pcntl pcre pcre16 pcre32 pdf plymouth png policykit postgres pulseaudio python readline realtime sasl sdl seccomp secure-delete sha2 sharedmem snap sox speex spell sqlite srp ssl svg tcl tcpd terminal threads tiff tk tools truetype udev unicode urandom utils uuid v4l valgrind vim-pager vim-syntax webp x264 x265 xattr xcb xetex xml xmlreader xmlrpc xmlwriter xpm xscreensaver xslt xvfb xvid yaml zimg zip zip-encryption zlib zstd" 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 authn_alias authn_anon authn_core authn_dbm authn_file authz_core authz_dbm authz_groupfile authz_host authz_owner authz_user autoindex brotli md cache cgi cgid dav dav_fs dav_lock deflate dir env expires ext_filter file_cache filter headers include info log_config logio mime mime_magic negotiation rewrite setenvif socache_shmcb speling status unique_id unixd userdir usertrack vhost_alias access_compat asis auth_digest authn_dbd authz_dbd cache_disk cache_socache cern_meta charset_lite dbd dumpio http2 ident imagemap macro version xml2enc proxy proxy_ajp proxy_connect proxy_fcgi proxy_html proxy_http proxy_scgi watchdog animgif libidn2" APACHE2_MPMS="worker" CALLIGRA_FEATURES="karbon sheets words" COLLECTD_PLUGINS="df interface irq load memory rrdtool swap syslog" CPU_FLAGS_X86="avx mmx mmxext pclmul popcnt sse sse2 sse3 sse4_1 sse4_2 ssse3" CURL_SSL="openssl" 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" L10N="ko" LCD_DEVICES="bayrad cfontz cfontz633 glk hd44780 lb216 lcdm001 mtxorb ncurses text" LIBREOFFICE_EXTENSIONS="presenter-console presenter-minimizer" NETBEANS_MODULES="apisupport cnd groovy gsf harness ide identity j2ee java mobility nb php profiler soa visualweb webcommon websvccommon xml" OFFICE_IMPLEMENTATION="libreoffice" PHP_TARGETS="php7-2" POSTGRES_TARGETS="postgres9_5 postgres10" PYTHON_SINGLE_TARGET="python3_6" PYTHON_TARGETS="python3_6 python2_7" RUBY_TARGETS="ruby25 ruby26" USERLAND="GNU" VIDEO_CARDS="fbdev intel vesa" 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