emerge --info '=app-arch/libarchive-3.3.3::gentoo_prefix'

$ emerge --info '=app-arch/libarchive-3.3.3::gentoo_prefix'
!!! No gcc found. You probably need to 'source /etc/profile'
!!! to update the environment of this terminal and possibly
!!! other terminals also.
Portage 2.3.52.2-prefix (python 2.7.3-final-0, prefix/darwin/macos/10.14/x64, [unavailable], unavailable, 18.5.0 x86_64)
=================================================================
                         System Settings
=================================================================
System uname: Darwin-18.5.0-x86_64-i386-64bit
Timestamp of repository gentoo_prefix: Wed, 27 Mar 2019 01:59:06 +0000
Head commit of repository gentoo_prefix: c65e1b87989e50b122242933ece4829c8ff5cac9
sh bash 5.0_p3-r1
Repositories:

gentoo_prefix
    location: /Users/curtis/gentoo/usr/portage
    sync-type: rsync
    sync-uri: rsync://rsync.prefix.bitzolder.nl/gentoo-portage-prefix
    priority: -1000
    sync-rsync-verify-jobs: 1
    sync-rsync-verify-metamanifest: yes
    sync-rsync-extra-opts:
    sync-rsync-verify-max-age: 24

ACCEPT_KEYWORDS="~x64-macos"
ACCEPT_LICENSE="* -@EULA"
CBUILD="x86_64-apple-darwin18"
CFLAGS="-march=native -O2 -pipe"
CHOST="x86_64-apple-darwin18"
CONFIG_PROTECT="/etc"
CONFIG_PROTECT_MASK="/etc/env.d /etc/gconf"
CXXFLAGS="-march=native -O2 -pipe"
DISTDIR="/Users/curtis/gentoo/tmp/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=""
FEATURES="assume-digests binpkg-docompress binpkg-dostrip binpkg-logs case-insensitive-fs config-protect-if-modified distlocks ebuild-locks fixlafiles force-prefix ipc-sandbox merge-sync multilib-strict network-sandbox news nostrip parallel-fetch pid-sandbox preserve-libs protect-owned sfperms strict unknown-features-warn unmerge-logs unmerge-orphans unprivileged"
FFLAGS=""
GENTOO_MIRRORS="http://distfiles.gentoo.org"
LANG="en_US.UTF-8"
LDFLAGS="-Wl,-dead_strip_dylibs"
MAKEOPTS=""
PKGDIR="/Users/curtis/gentoo/tmp/usr/portage/packages"
PORTAGE_CONFIGROOT="/Users/curtis/gentoo/tmp/"
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="/Users/curtis/gentoo/tmp/var/tmp"
USE="aqua coreaudio cxx ipv6 ncurses nls objc objc++ prefix prefix-guest readline ssl unicode x64-macos zlib" ABI_X86="64" 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="Darwin" 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="keyboard mouse" KERNEL="Darwin" 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="php5-6 php7-1" POSTGRES_TARGETS="postgres9_5 postgres10" PYTHON_SINGLE_TARGET="python3_6" PYTHON_TARGETS="python2_7 python3_6" RUBY_TARGETS="ruby24" USERLAND="GNU" 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, LINGUAS, PORTAGE_BINHOST, PORTAGE_BUNZIP2_COMMAND, PORTAGE_COMPRESS, PORTAGE_COMPRESS_FLAGS, PORTAGE_RSYNC_EXTRA_OPTS