If USE=test or FEATURES=test enabled, build dev-perl/Devel-StackTrace-1.15 test phase requires Test::Pod::Coverage and Test::Pod perl package.
Portage output >>> Emerging (21 of 31) dev-perl/Devel-StackTrace-1.15 * Devel-StackTrace-1.15.tar.gz RMD160 SHA1 SHA256 size ;-) ... [ ok ] * checking ebuild checksums ;-) ... [ ok ] * checking auxfile checksums ;-) ... [ ok ] * checking miscfile checksums ;-) ... [ ok ] >>> Unpacking source... >>> Unpacking Devel-StackTrace-1.15.tar.gz to /var/tmp/portage/dev-perl/Devel-StackTrace-1.15/work >>> Source unpacked in /var/tmp/portage/dev-perl/Devel-StackTrace-1.15/work >>> Compiling source in /var/tmp/portage/dev-perl/Devel-StackTrace-1.15/work/Devel-StackTrace-1.15 ... * Using Module::Build Checking whether your kit is complete... Looks good Checking prerequisites... Looks good Creating new 'Build' script for 'Devel-StackTrace' version '1.15' Copying lib/Devel/StackTrace.pm -> blib/lib/Devel/StackTrace.pm Manifying blib/lib/Devel/StackTrace.pm -> blib/libdoc/Devel::StackTrace.3pm >>> Source compiled. t/01-basic........ok t/pod-coverage....skipped all skipped: Test::Pod::Coverage 1.04 required for testing POD coverage t/pod.............skipped all skipped: Test::Pod 1.00 required for testing POD All tests successful, 2 tests skipped. Files=3, Tests=34, 0 wallclock secs ( 0.07 cusr + 0.01 csys = 0.08 CPU) >>> Install Devel-StackTrace-1.15 into /var/tmp/portage/dev-perl/Devel-StackTrace-1.15/image/ category dev-perl Installing /var/tmp/portage/dev-perl/Devel-StackTrace-1.15/image/usr/lib64/perl5/vendor_perl/5.8.8/Devel/StackTrace.pm Installing /var/tmp/portage/dev-perl/Devel-StackTrace-1.15/image/usr/share/man/man3/Devel::StackTrace.3pm >>> Completed installing Devel-StackTrace-1.15 into /var/tmp/portage/dev-perl/Devel-StackTrace-1.15/image/ ./ ./usr/ ./usr/lib64/ ./usr/lib64/perl5/ ./usr/lib64/perl5/vendor_perl/ ./usr/lib64/perl5/vendor_perl/5.8.8/ ./usr/lib64/perl5/vendor_perl/5.8.8/Devel/ ./usr/lib64/perl5/vendor_perl/5.8.8/Devel/StackTrace.pm ./usr/share/ ./usr/share/doc/ ./usr/share/doc/Devel-StackTrace-1.15/ ./usr/share/doc/Devel-StackTrace-1.15/Changes.bz2 ./usr/share/doc/Devel-StackTrace-1.15/README.bz2 >>> Done.