Details of dev-lang/perl:

UPDATE THE PERL MODULES:
After updating dev-lang/perl to a new major version the installed Perl modules
have to be re-installed. In most cases, this is done automatically
by the package manager.
ONLY if you encounter problems, call perl-cleaner to clean up any old files
and trigger any remaining rebuilds portage may have missed.
Use: perl-cleaner --all
TOGGLED PERL FEATURES WARNING:
You changed one of the PERL_FEATURES flags ithreads, quadmath, or debug.
You must rebuild all perl-modules installed. Mostly this should be done automatically
via the flag changes of the packages. If the rebuild fails, use perl-cleaner.
Use: perl-cleaner --modules ; perl-cleaner --force --libperl
NOTE: Previous to perl-5.38.2-r3, these flags were useflags for dev-lang/perl.
If you just upgraded and do not intend to change anything, carry the same settings over
into a global PERL_FEATURES variable set in make.conf. E.g., 
dev-lang/perl[ithreads,quadmath] becomes PERL_FEATURES=\
As of dev-lang/perl-5.38.2-r3, the useflags debug, ithreads, quadmath move into
a use-expand variable PERL_FEATURES, which should be set globally in make.conf.
It appears that you have not set this variable properly yet.

Giving you a chance to abort and read the corresponding news item now...
You must reinstall ${pkg} !
${i} does not exist!
${i} does not exist!
No ${expr} found in ${patchdir} to remove
No description provided for ${patch} (expected: ${desc_f} )
Perl will not be built with berkdb support, use gcc if you need it...
local -a EXTRA_ECONF=(${EXTRA_ECONF})
Test fails with a sandbox error (#328793) if run as root. Skipping tests...

UPDATE THE PERL MODULES:
After updating dev-lang/perl to a new major version the installed Perl modules
have to be re-installed. In most cases, this is done automatically
by the package manager.
ONLY if you encounter problems, call perl-cleaner to clean up any old files
and trigger any remaining rebuilds portage may have missed.
Use: perl-cleaner --all
TOGGLED PERL FEATURES WARNING:
You changed one of the PERL_FEATURES flags ithreads, quadmath, or debug.
You must rebuild all perl-modules installed. Mostly this should be done automatically
via the flag changes of the packages. If the rebuild fails, use perl-cleaner.
Use: perl-cleaner --modules ; perl-cleaner --force --libperl
NOTE: Previous to perl-5.38.2-r3, these flags were useflags for dev-lang/perl.
If you just upgraded and do not intend to change anything, carry the same settings over
into a global PERL_FEATURES variable set in make.conf. E.g., 
dev-lang/perl[ithreads,quadmath] becomes PERL_FEATURES=\
As of dev-lang/perl-5.38.2-r3, the useflags debug, ithreads, quadmath move into
a use-expand variable PERL_FEATURES, which should be set globally in make.conf.
It appears that you have not set this variable properly yet.

Giving you a chance to abort and read the corresponding news item now...
You must reinstall ${pkg} !
${i} does not exist!
${i} does not exist!
No ${expr} found in ${patchdir} to remove
No description provided for ${patch} (expected: ${desc_f} )
Perl will not be built with berkdb support, use gcc if you need it...
local -a EXTRA_ECONF=(${EXTRA_ECONF})
Test fails with a sandbox error (#328793) if run as root. Skipping tests...

UPDATE THE PERL MODULES:
After updating dev-lang/perl the installed Perl modules
have to be re-installed. In most cases, this is done automatically
by the package manager, but subsequent steps are still recommended
to ensure system consistency.
You should start with a depclean to remove any unused perl dependencies
that may confuse portage in future. Regular depcleans are also encouraged
as part of your regular update cycle, as that will keep perl upgrades working.
Recommended: emerge --depclean -va
You should then call perl-cleaner to clean up any old files and trigger any
remaining rebuilds portage may have missed.
Use: perl-cleaner --all
TOGGLED PERL FEATURES WARNING:
You changed one of the PERL_FEATURES flags ithreads, quadmath, or debug.
You must rebuild all perl-modules installed. Mostly this should be done automatically
via the flag changes of the packages. If the rebuild fails, use perl-cleaner.
Use: perl-cleaner --modules ; perl-cleaner --force --libperl
NOTE: Previous to perl-5.38.2-r3, these flags were useflags for dev-lang/perl.
If you just upgraded and do not intend to change anything, carry the same settings over
into a global PERL_FEATURES variable set in make.conf. E.g., 
dev-lang/perl[ithreads,quadmath] becomes PERL_FEATURES=\
As of dev-lang/perl-5.38.2-r3, the useflags debug, ithreads, quadmath move into
a use-expand variable PERL_FEATURES, which should be set globally in make.conf.
It appears that you have not set this variable properly yet.

Giving you a chance to abort and read the corresponding news item now...
You must reinstall ${pkg} !
${i} does not exist!
${i} does not exist!
No ${expr} found in ${patchdir} to remove
No description provided for ${patch} (expected: ${desc_f} )
Perl will not be built with berkdb support, use gcc if you need it...
local -a EXTRA_ECONF=(${EXTRA_ECONF})
Test fails with a sandbox error (#328793) if run as root. Skipping tests...