* Package:    dev-perl/JSON-4.100.0:0
 * Repository: gentoo
 * Maintainer: perl@gentoo.org
 * USE:        abi_x86_64 amd64 elibc_glibc kernel_linux xs
 * FEATURES:   network-sandbox preserve-libs sandbox userpriv usersandbox
>>> Unpacking source...
>>> Unpacking JSON-4.10.tar.gz to /var/tmp/portage/dev-perl/JSON-4.100.0/work
>>> Source unpacked in /var/tmp/portage/dev-perl/JSON-4.100.0/work
>>> Preparing source in /var/tmp/portage/dev-perl/JSON-4.100.0/work/JSON-4.10 ...
>>> Source prepared.
>>> Configuring source in /var/tmp/portage/dev-perl/JSON-4.100.0/work/JSON-4.10 ...
 * Using ExtUtils::MakeMaker
 * perl Makefile.PL AR=x86_64-pc-linux-gnu-ar CC=x86_64-pc-linux-gnu-gcc CPP=x86_64-pc-linux-gnu-gcc -E LD=x86_64-pc-linux-gnu-gcc NM=x86_64-pc-linux-gnu-nm RANLIB=x86_64-pc-linux-gnu-ranlib OPTIMIZE=-O3 -march=native -mtune=native -fomit-frame-pointer -pipe LDFLAGS=-Wl,-O1 -Wl,--as-needed -Wl,-z,pack-relative-relocs PREFIX=/usr INSTALLDIRS=vendor INSTALLMAN3DIR=none
Welcome to JSON (v.4.10)
=============================

 ** BACKWARD INCOMPATIBILITY **

Since version 2.90, stringification (and string comparison) for
JSON::true and JSON::false has not been overloaded. It shouldn't
matter as long as you treat them as boolean values, but a code that
expects they are stringified as "true" or "false" doesn't work as
you have expected any more.

    if (JSON::true eq 'true') {  # now fails

    print "The result is 1 now."; # => The result is 1 now.

And now these boolean values don't inherit JSON::Boolean, either.
When you need to test a value is a JSON boolean value or not, use
JSON::is_bool function, instead of testing the value inherits
a particular boolean class or not.

Checking if your kit is complete...
Looks good
'CPP' is not a known MakeMaker parameter name.
'NM' is not a known MakeMaker parameter name.
Generating a Unix-style Makefile
Writing Makefile for JSON
Writing MYMETA.yml and MYMETA.json
>>> Source configured.
>>> Compiling source in /var/tmp/portage/dev-perl/JSON-4.100.0/work/JSON-4.10 ...
make -j2 'OTHERLDFLAGS=-Wl,-O1 -Wl,--as-needed -Wl,-z,pack-relative-relocs' 'OPTIMIZE=-O3 -march=native -mtune=native -fomit-frame-pointer -pipe' 
cp lib/JSON/backportPP/Compat5006.pm blib/lib/JSON/backportPP/Compat5006.pm
cp lib/JSON/backportPP/Boolean.pm blib/lib/JSON/backportPP/Boolean.pm
cp lib/JSON.pm blib/lib/JSON.pm
cp lib/JSON/backportPP/Compat5005.pm blib/lib/JSON/backportPP/Compat5005.pm
cp lib/JSON/backportPP.pm blib/lib/JSON/backportPP.pm
>>> Source compiled.
 * Skipping make test/check due to ebuild restriction.
>>> Test phase [disabled because of RESTRICT=test]: dev-perl/JSON-4.100.0

>>> Install dev-perl/JSON-4.100.0 into /var/tmp/portage/dev-perl/JSON-4.100.0/image
make -j2 DESTDIR=/var/tmp/portage/dev-perl/JSON-4.100.0/image pure_install 
Installing /var/tmp/portage/dev-perl/JSON-4.100.0/image/usr/lib64/perl5/vendor_perl/5.40/JSON.pm
Installing /var/tmp/portage/dev-perl/JSON-4.100.0/image/usr/lib64/perl5/vendor_perl/5.40/JSON/backportPP.pm
Installing /var/tmp/portage/dev-perl/JSON-4.100.0/image/usr/lib64/perl5/vendor_perl/5.40/JSON/backportPP/Boolean.pm
Installing /var/tmp/portage/dev-perl/JSON-4.100.0/image/usr/lib64/perl5/vendor_perl/5.40/JSON/backportPP/Compat5005.pm
Installing /var/tmp/portage/dev-perl/JSON-4.100.0/image/usr/lib64/perl5/vendor_perl/5.40/JSON/backportPP/Compat5006.pm
 * Fixing installed file permissions
 * Fixing packlist file //usr/lib64/perl5/vendor_perl/5.40/x86_64-linux/auto/JSON/.packlist
>>> Completed installing dev-perl/JSON-4.100.0 into /var/tmp/portage/dev-perl/JSON-4.100.0/image

 * Final size of build directory: 848 KiB
 * Final size of installed tree:  304 KiB