>> Install dev-lang/ruby-3.1.3 into /var/tmp/portage/dev-lang/ruby-3.1.3/image
 * Removing default gems before installation
make -j4 V=1 DESTDIR=/var/tmp/portage/dev-lang/ruby-3.1.3/image GEM_DESTDIR=/usr/lib64/ruby/gems/3.1.0 install
./config.status --file=-:./template/ruby.pc.in | \
sed -e 's/\$(\([A-Za-z_][A-Za-z0-9_]*\))/${\1}/g' \
    -e 's|^prefix=.*|prefix=/usr|' \
    > ruby.tmp.pc
: > revision.tmp
    BASERUBY = /usr/bin/ruby --disable=gems
    CC = aarch64-unknown-linux-gnu-gcc
    LD = aarch64-unknown-linux-gnu-ld
    LDSHARED = aarch64-unknown-linux-gnu-gcc -shared
    CFLAGS = -march=armv8-a+crc -mtune=cortex-a72 -ftree-vectorize -O2 -pipe -fno-strict-aliasing -fPIC
    XCFLAGS = -D_FORTIFY_SOURCE=2 -fstack-protector-strong -fno-strict-overflow -fvisibility=hidden -fexcess-precision=standard -DRUBY_EXPORT -I. -I.ext/include/aarch64-linux -I./include -I. -I./enc/unicode/13.0.0
    CPPFLAGS =
    DLDFLAGS = -Wl,-O1 -Wl,--sort-common -Wl,--as-needed -Wl,--compress-debug-sections=zlib -Wl,-soname,libruby31.so.3.1  -fstack-protector-strong
    SOLIBS = -lz -lpthread -lrt -lrt -lgmp -ldl -lcrypt -lm
    LANG = en_US.UTF-8
    LC_ALL =
    LC_CTYPE =
    MFLAGS = -j4 --jobserver-auth=4,5
/usr/bin/ruby --disable=gems -C "." \
    -Itool/lib -rfileutils -rbundled_gem -answ \
    -e 'BEGIN {FileUtils.mkdir_p(d = ".bundle/gems")}' \
    -e 'gem, ver, _, rev = *$F' \
    -e 'next if !ver or /^#/=~gem' \
    -e 'g = "#{gem}-#{ver}"' \
    -e 'if File.directory?("#{d}/#{g}")' \
    -e 'elsif rev and File.exist?(gs = "gems/src/#{gem}/#{gem}.gemspec")' \
    -e   'BundledGem.copy(gs, ".bundle")' \
    -e 'else' \
    -e   'BundledGem.unpack("gems/#{g}.gem", ".bundle")' \
    -e 'end' \
    -e 'FileUtils.rm_rf("#{d}/#{g}/.github")' \
    gems/bundled_gems
aarch64-unknown-linux-gnu-gcc (Funtoo 11.3.0-r1) 11.3.0
Copyright (C) 2021 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
/usr/bin/ruby --disable=gems ./tool/file2lastrev.rb -q --revision.h --srcdir="." > revision.tmp
/usr/lib64/ruby/2.6.0/rubygems.rb:16:in `require': cannot load such file -- rubygems/compatibility (LoadError)
    from /usr/lib64/ruby/2.6.0/rubygems.rb:16:in `<top (required)>'
    from /var/tmp/portage/dev-lang/ruby-3.1.3/work/ruby-3.1.3/tool/lib/bundled_gem.rb:2:in `require'
    from /var/tmp/portage/dev-lang/ruby-3.1.3/work/ruby-3.1.3/tool/lib/bundled_gem.rb:2:in `<top (required)>'
    from -e:1:in `require'
make: *** [uncommon.mk:1370: extract-gems-sequential] Error 1
make: *** Waiting for unfinished jobs....
pkg_config= && PKG_CONFIG_PATH=. ${pkg_config:-:} --print-errors ruby.tmp
mv -f ruby.tmp.pc ruby-3.1.pc
 * ERROR: dev-lang/ruby-3.1.3::ruby-kit failed (install phase):
 *   emake failed