user@2a48ac5f80d5:/tmp/gentoo$ emerge --info 
Portage 2.3.100 (python 3.7.7-final-0, !/tmp/gentoo/var/db/repos/gentoo/profiles/default/linux/amd64/17.0/no-multilib/prefix/kernel-3.2+, gcc-10.1.0, glibc-2.31-r3, 4.15.0-42-generic x86_64)
=================================================================
System uname: Linux-4.15.0-42-generic-x86_64-Intel-R-_Core-TM-_i7-6700HQ_CPU_@_2.60GHz-with-debian-stretch-sid
KiB Mem:    16293808 total,   1493840 free
KiB Swap:   17050620 total,  17049852 free
Timestamp of repository gentoo: Mon, 01 Jun 2020 13:35:34 +0000
Head commit of repository gentoo: a8a6535614b7bfeffd031115378c47da96d5f1d9

Head commit of repository ros-overlay: ee1bf8b528ca7717957c614967cdc04074f39b59

sh bash 5.0_p17
ld GNU ld (Gentoo 2.34 p4) 2.34.0
app-shells/bash:          5.0_p17::gentoo
dev-lang/perl:            5.30.2-r2::gentoo
dev-lang/python:          2.7.18::gentoo, 3.6.10-r2::gentoo, 3.7.7-r2::gentoo
dev-util/cmake:           3.17.3::gentoo
sys-apps/baselayout:      2.7::gentoo
sys-apps/sandbox:         2.18::gentoo
sys-devel/autoconf:       2.69-r5::gentoo
sys-devel/automake:       1.16.2::gentoo
sys-devel/binutils:       2.34-r1::gentoo
sys-devel/gcc:            10.1.0::gentoo
sys-devel/gcc-config:     2.3::gentoo
sys-devel/libtool:        2.4.6-r6::gentoo
sys-devel/make:           4.3::gentoo
sys-kernel/linux-headers: 5.6::gentoo (virtual/os-headers)
sys-libs/glibc:           2.31-r3::gentoo
Repositories:

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

ros-overlay
    location: /tmp/gentoo/usr/local/portage
    sync-type: git
    sync-uri: https://github.com/ros/ros-overlay
    masters: gentoo

ACCEPT_KEYWORDS="amd64 ~amd64"
ACCEPT_LICENSE="@FREE"
CBUILD="x86_64-pc-linux-gnu"
CFLAGS="-O2 -pipe -O2 -pipe"
CHOST="x86_64-pc-linux-gnu"
CONFIG_PROTECT="/etc /tmp/gentoo/etc /usr/share/gnupg/qualified.txt"
CONFIG_PROTECT_MASK="/etc/ca-certificates.conf /etc/env.d /etc/fonts/fonts.conf /etc/gconf /etc/sandbox.d /etc/terminfo /tmp/gentoo/etc/env.d /tmp/gentoo/etc/gentoo-release"
CXXFLAGS="-O2 -pipe -O2 -pipe"
DISTDIR="/tmp/gentoo/var/cache/distfiles"
EMERGE_DEFAULT_OPTS="--jobs 1 --load-average 2"
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-docompress binpkg-dostrip binpkg-logs config-protect-if-modified distlocks ebuild-locks fixlafiles force-prefix ipc-sandbox merge-sync multilib-strict network-sandbox news parallel-fetch pid-sandbox preserve-libs protect-owned qa-unresolved-soname-deps sfperms strict unknown-features-warn unmerge-logs unmerge-orphans unprivileged"
FFLAGS="-O2 -pipe"
GENTOO_MIRRORS="http://distfiles.gentoo.org"
LDFLAGS="-Wl,-O1 -Wl,--as-needed"
MAKEOPTS="-j4"
PKGDIR="/tmp/gentoo/var/cache/binpkgs"
PORTAGE_CONFIGROOT="/tmp/gentoo/"
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="/tmp/gentoo/var/tmp"
USE="acl amd64 berkdb bzip2 cli crypt dri fortran gdbm iconv ipv6 libtirpc ncurses nls nptl openmp pam pcre prefix readline seccomp split-usr ssl tcpd unicode zlib" ABI_X86="64" ADA_TARGET="gnat_2018" 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="karbon sheets 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 greis isync itrax mtk3301 nmea ntrip navcom oceanserver oldstyle oncore rtcm104v2 rtcm104v3 sirf skytraq superstar2 timing tsip tripmate tnt ublox ubx" INPUT_DEVICES="libinput" 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="php7-2" POSTGRES_TARGETS="postgres10 postgres11" PYTHON_SINGLE_TARGET="python3_7" PYTHON_TARGETS="python2_7 python3_7" RUBY_TARGETS="ruby24 ruby25" 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, INSTALL_MASK, LANG, LC_ALL, LINGUAS, PORTAGE_BINHOST, PORTAGE_BUNZIP2_COMMAND, PORTAGE_COMPRESS, PORTAGE_COMPRESS_FLAGS, PORTAGE_RSYNC_EXTRA_OPTS