These are the packages that would be merged, in order:

Calculating dependencies ... done!
Dependency resolution took 7.32 s (backtrack: 6/20).

[ebuild  N     ] dev-perl/Module-Runtime-0.18.0::gentoo  USE="-test" PERL_FEATURES="ithreads (-debug) -quadmath" 27 KiB
[ebuild  N     ] dev-perl/File-Which-1.270.0-r1::gentoo  USE="-pwhich -test" PERL_FEATURES="ithreads (-debug) -quadmath" 25 KiB
[ebuild  N     ] virtual/perl-if-0.61.0-r4::gentoo  0 KiB
[ebuild  N     ] virtual/perl-Module-Load-0.360.0-r6::gentoo  0 KiB
[ebuild  N     ] dev-perl/Math-Libm-1.0.0-r2::gentoo  USE="-test" PERL_FEATURES="ithreads (-debug) -quadmath" 5 KiB
[ebuild  N     ] dev-perl/constant-defer-6.0.0-r1::gentoo  USE="-examples -test" PERL_FEATURES="ithreads (-debug) -quadmath" 43 KiB
[ebuild  N     ] dev-perl/boolean-0.460.0-r1::gentoo  USE="-test" PERL_FEATURES="ithreads (-debug) -quadmath" 16 KiB
[ebuild  N     ] dev-perl/Module-Implementation-0.90.0-r1::gentoo  USE="-test" PERL_FEATURES="ithreads (-debug) -quadmath" 19 KiB
[ebuild  N     ] dev-perl/Params-Validate-1.310.0::gentoo  USE="-examples -test" PERL_FEATURES="ithreads (-debug) -quadmath" 209 KiB
[ebuild  N     ] dev-perl/Module-Pluggable-6.300.0::gentoo  USE="-test" PERL_FEATURES="ithreads (-debug) -quadmath" 29 KiB
[ebuild  N     ] dev-perl/Module-Util-1.90.0-r1::gentoo  USE="-test" PERL_FEATURES="ithreads (-debug) -quadmath" 12 KiB
[ebuild  N     ] dev-perl/Math-Prime-XS-0.270.0-r1::gentoo  USE="-test" PERL_FEATURES="ithreads (-debug) -quadmath" 63 KiB
[ebuild  N     ] dev-perl/Math-Factor-XS-0.400.0-r1::gentoo  USE="-test" PERL_FEATURES="ithreads (-debug) -quadmath" 61 KiB
[ebuild  N     ] dev-perl/Math-BigInt-GMP-1.700.300::gentoo  USE="-test" PERL_FEATURES="ithreads (-debug) -quadmath" 2576 KiB
[ebuild  NS    ] app-text/docbook-xml-dtd-4.3-r2:4.3::gentoo [4.1.2-r7:4.1.2::gentoo, 4.2-r3:4.2::gentoo, 4.4-r3:4.4::gentoo, 4.5-r2:4.5::gentoo] 82 KiB
[ebuild  N     ] x11-misc/xdg-user-dirs-0.20::gentoo  USE="-gtk" 53 KiB
[ebuild  N     ] dev-perl/File-HomeDir-1.6.0-r1::gentoo  USE="xdg -test" PERL_FEATURES="ithreads (-debug) -quadmath" 36 KiB
[ebuild  N     ] dev-perl/Math-NumSeq-75.0.0::gentoo  USE="-examples -test" PERL_FEATURES="ithreads (-debug) -quadmath" 848 KiB
[ebuild  N     ] dev-perl/Math-PlanePath-129.0.0::gentoo  USE="gmp -examples -test" PERL_FEATURES="ithreads (-debug) -quadmath" 1472 KiB

Total: 19 packages (18 new, 1 in new slot), Size of downloads: 5566 KiB

WARNING: One or more updates/rebuilds have been skipped due to a dependency conflict:

dev-lang/perl:0

  (dev-lang/perl-5.44.0:0/5.44::gentoo, ebuild scheduled for merge) USE="gdbm -berkdb -doc -minimal" PERL_FEATURES="ithreads (-debug) -quadmath" conflicts with
    =dev-lang/perl-5.42* required by (virtual/perl-version-0.993.300:0/0::gentoo, installed) USE=""
    ^              ^^^^^
    =dev-lang/perl-5.42* required by (virtual/perl-CPAN-Meta-2.150.10-r11:0/0::gentoo, installed) USE=""
    ^              ^^^^^
    dev-lang/perl:0/5.42= required by (virtual/perl-File-Path-2.180.0-r4:0/0::gentoo, installed) USE=""
                 ^^^^^^^^
    =dev-lang/perl-5.42* required by (virtual/perl-File-Spec-3.940.0:0/0::gentoo, installed) USE=""
    ^              ^^^^^
    =dev-lang/perl-5.42* required by (virtual/perl-Storable-3.370.0:0/0::gentoo, installed) USE=""
    ^              ^^^^^
    =dev-lang/perl-5.42* required by (virtual/perl-Scalar-List-Utils-1.680.100_rc:0/0::gentoo, installed) USE=""
    ^              ^^^^^
    dev-lang/perl:0/5.42= required by (virtual/perl-CPAN-Meta-2.150.10-r11:0/0::gentoo, installed) USE=""
                 ^^^^^^^^
    dev-lang/perl:0/5.42= required by (virtual/perl-File-Spec-3.940.0:0/0::gentoo, installed) USE=""
                 ^^^^^^^^
    dev-lang/perl:0/5.42= required by (virtual/perl-version-0.993.300:0/0::gentoo, installed) USE=""
                 ^^^^^^^^
    dev-lang/perl:0/5.42= required by (virtual/perl-Storable-3.370.0:0/0::gentoo, installed) USE=""
                 ^^^^^^^^
    =dev-lang/perl-5.42* required by (virtual/perl-Math-BigInt-2.5.2:0/0::gentoo, installed) USE=""
    ^              ^^^^^
    dev-lang/perl:0/5.42= required by (virtual/perl-Scalar-List-Utils-1.680.100_rc:0/0::gentoo, installed) USE=""
                 ^^^^^^^^
    =dev-lang/perl-5.42* required by (virtual/perl-ExtUtils-CBuilder-0.280.242-r2:0/0::gentoo, installed) USE=""
    ^              ^^^^^
    =dev-lang/perl-5.42* required by (virtual/perl-libnet-3.150.0-r2:0/0::gentoo, installed) USE="ssl"
    ^              ^^^^^
    dev-lang/perl:0/5.42= required by (virtual/perl-ExtUtils-CBuilder-0.280.242-r2:0/0::gentoo, installed) USE=""
                 ^^^^^^^^
    dev-lang/perl:0/5.42= required by (virtual/perl-Math-BigInt-2.5.2:0/0::gentoo, installed) USE=""
                 ^^^^^^^^
    =dev-lang/perl-5.42* required by (virtual/perl-Text-ParseWords-3.310.0-r4:0/0::gentoo, installed) USE=""
    ^              ^^^^^
    dev-lang/perl:0/5.42= required by (virtual/perl-libnet-3.150.0-r2:0/0::gentoo, installed) USE="ssl"
                 ^^^^^^^^
    =dev-lang/perl-5.42* required by (virtual/perl-IO-1.550.0-r1:0/0::gentoo, installed) USE=""
    ^              ^^^^^
    =dev-lang/perl-5.42* required by (virtual/perl-Digest-SHA-6.40.0-r2:0/0::gentoo, installed) USE=""
    ^              ^^^^^
    dev-lang/perl:0/5.42= required by (virtual/perl-Text-ParseWords-3.310.0-r4:0/0::gentoo, installed) USE=""
                 ^^^^^^^^
    =dev-lang/perl-5.42* required by (virtual/perl-XSLoader-0.320.0-r2:0/0::gentoo, installed) USE=""
    ^              ^^^^^
    =dev-lang/perl-5.42* required by (virtual/perl-Exporter-5.790.0:0/0::gentoo, installed) USE=""
    ^              ^^^^^
    dev-lang/perl:0/5.42= required by (virtual/perl-JSON-PP-4.160.0-r3:0/0::gentoo, installed) USE=""
                 ^^^^^^^^
    dev-lang/perl:0/5.42= required by (virtual/perl-IO-1.550.0-r1:0/0::gentoo, installed) USE=""
                 ^^^^^^^^
    =dev-lang/perl-5.42* required by (virtual/perl-Carp-1.540.0-r2:0/0::gentoo, installed) USE=""
    ^              ^^^^^
    =dev-lang/perl-5.42* required by (virtual/perl-ExtUtils-MakeMaker-7.760.0:0/0::gentoo, installed) USE=""
    ^              ^^^^^
    =dev-lang/perl-5.42* required by (virtual/perl-ExtUtils-ParseXS-3.570.0:0/0::gentoo, installed) USE=""
    ^              ^^^^^
    =dev-lang/perl-5.42* required by (virtual/perl-Module-Metadata-1.0.38-r1:0/0::gentoo, installed) USE=""
    ^              ^^^^^
    dev-lang/perl:0/5.42= required by (virtual/perl-Digest-SHA-6.40.0-r2:0/0::gentoo, installed) USE=""
                 ^^^^^^^^
    =dev-lang/perl-5.42* required by (virtual/perl-podlators-6.0.2:0/0::gentoo, installed) USE=""
    ^              ^^^^^
    dev-lang/perl:0/5.42= required by (virtual/perl-Carp-1.540.0-r2:0/0::gentoo, installed) USE=""
                 ^^^^^^^^
    dev-lang/perl:0/5.42= required by (virtual/perl-ExtUtils-MakeMaker-7.760.0:0/0::gentoo, installed) USE=""
                 ^^^^^^^^
    dev-lang/perl:0/5.42= required by (virtual/perl-ExtUtils-ParseXS-3.570.0:0/0::gentoo, installed) USE=""
                 ^^^^^^^^
    dev-lang/perl:0/5.42= required by (virtual/perl-XSLoader-0.320.0-r2:0/0::gentoo, installed) USE=""
                 ^^^^^^^^
    dev-lang/perl:0/5.42= required by (virtual/perl-Exporter-5.790.0:0/0::gentoo, installed) USE=""
                 ^^^^^^^^
    dev-lang/perl:0/5.42= required by (virtual/perl-Module-Metadata-1.0.38-r1:0/0::gentoo, installed) USE=""
                 ^^^^^^^^
    =dev-lang/perl-5.42* required by (virtual/perl-File-Path-2.180.0-r4:0/0::gentoo, installed) USE=""
    ^              ^^^^^
    dev-lang/perl:0/5.42= required by (virtual/perl-podlators-6.0.2:0/0::gentoo, installed) USE=""
                 ^^^^^^^^
    =dev-lang/perl-5.42* required by (virtual/perl-JSON-PP-4.160.0-r3:0/0::gentoo, installed) USE=""
    ^              ^^^^^
    =dev-lang/perl-5.42* required by (virtual/perl-Digest-MD5-2.590.0:0/0::gentoo, installed) USE=""
    ^              ^^^^^
    dev-lang/perl:0/5.42= required by (virtual/perl-Digest-MD5-2.590.0:0/0::gentoo, installed) USE=""
                 ^^^^^^^^


!!! The following update(s) have been skipped due to unsatisfied dependencies
!!! triggered by backtracking:

virtual/perl-Encode:0
virtual/perl-Test-Harness:0