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

Calculating dependencies ... done!
Dependency resolution took 4.08 s (backtrack: 0/20).

[ebuild  N     ] sys-libs/db-6.0.35-r5:6.0::gentoo  USE="-cxx -doc -examples -tcl -test" 35677 KiB
[ebuild     U  ] dev-lang/perl-5.44.0:0/5.44::gentoo [5.42.0-r1:0/5.42::gentoo] USE="berkdb* gdbm -doc -minimal" PERL_FEATURES="ithreads (-debug) -quadmath" 14704 KiB
[ebuild  N     ] virtual/perl-DB_File-1.860.0::gentoo  0 KiB
[ebuild  N     ] dev-perl/DB_File-Lock-0.50.0-r3::gentoo  USE="-test" PERL_FEATURES="ithreads (-debug) -quadmath" 8 KiB

Total: 4 packages (1 upgrade, 3 new), Size of downloads: 50388 KiB

!!! Multiple package instances within a single package slot have been pulled
!!! into the dependency graph, resulting in a slot conflict:

dev-lang/perl:0

  (dev-lang/perl-5.42.0-r1:0/5.42::gentoo, installed) USE="gdbm -berkdb -doc -minimal" PERL_FEATURES="ithreads (-debug) -quadmath" pulled in by
    dev-lang/perl:0/5.42= required by (virtual/perl-CPAN-2.380.0:0/0::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: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-Data-Dumper-2.192.0:0/0::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:0/5.42= required by (virtual/perl-Sys-Syslog-0.360.0-r5:0/0::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-Sys-Syslog-0.360.0-r5:0/0::gentoo, installed) USE=""
    ^              ^^^^^                                                                                                                                      
    dev-lang/perl:0/5.42= required by (virtual/perl-Digest-MD5-2.590.0:0/0::gentoo, installed) USE=""
                 ^^^^^^^^                                                                                                                
    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-Carp-1.540.0-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: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-Digest-SHA-6.40.0-r2:0/0::gentoo, installed) USE=""
                 ^^^^^^^^                                                                                                                  
    (and 78 more with the same problems)

  (dev-lang/perl-5.44.0:0/5.44::gentoo, ebuild scheduled for merge) USE="berkdb gdbm -doc -minimal" PERL_FEATURES="ithreads (-debug) -quadmath" pulled in by
    =dev-lang/perl-5.44*[berkdb] required by (virtual/perl-DB_File-1.860.0:0/0::gentoo, ebuild scheduled for merge) USE=""
    ^              ^^^^^                                                                                                                                                         

NOTE: Use the '--verbose-conflicts' option to display parents omitted above

!!! The slot conflict(s) shown above involve package(s) which may need to
!!! be rebuilt in order to solve the conflict(s). However, the following
!!! package(s) cannot be rebuilt for the reason(s) shown:

  (virtual/perl-JSON-PP-4.160.0-r3:0/0::gentoo, installed): ebuild is masked or unavailable
  (virtual/perl-Sys-Syslog-0.360.0-r5:0/0::gentoo, installed): ebuild is masked or unavailable
  (virtual/perl-Digest-MD5-2.590.0:0/0::gentoo, installed): ebuild is masked or unavailable
  (virtual/perl-Text-ParseWords-3.310.0-r4:0/0::gentoo, installed): ebuild is masked or unavailable
  (virtual/perl-Carp-1.540.0-r2:0/0::gentoo, installed): ebuild is masked or unavailable
  (virtual/perl-libnet-3.150.0-r2:0/0::gentoo, installed): ebuild is masked or unavailable
  (virtual/perl-Data-Dumper-2.192.0:0/0::gentoo, installed): ebuild is masked or unavailable
  (virtual/perl-Digest-SHA-6.40.0-r2:0/0::gentoo, installed): ebuild is masked or unavailable
  (virtual/perl-podlators-6.0.2:0/0::gentoo, installed): ebuild is masked or unavailable
  (virtual/perl-CPAN-2.380.0:0/0::gentoo, installed): ebuild is masked or unavailable
  (virtual/perl-Exporter-5.790.0:0/0::gentoo, installed): ebuild is masked or unavailable
  (virtual/perl-File-Path-2.180.0-r4:0/0::gentoo, installed): ebuild is masked or unavailable
  (virtual/perl-XSLoader-0.320.0-r2:0/0::gentoo, installed): ebuild is masked or unavailable


It may be possible to solve this problem by using package.mask to
prevent one of those packages from being selected. However, it is also
possible that conflicting dependencies exist such that they are
impossible to satisfy simultaneously.  If such a conflict exists in
the dependencies of two different packages, then those packages can
not be installed simultaneously.

For more information, see MASKED PACKAGES section in the emerge man
page or refer to the Gentoo Handbook.


The following USE changes are necessary to proceed:
 (see "package.use" in the portage(5) man page for more details)
# required by virtual/perl-DB_File-1.860.0::gentoo
# required by dev-perl/DB_File-Lock-0.50.0-r3::gentoo
# required by =dev-perl/DB_File-Lock-0.50.0-r3 (argument)
>=dev-lang/perl-5.44.0 berkdb

 * In order to avoid wasting time, backtracking has terminated early
 * due to the above autounmask change(s). The --autounmask-backtrack=y
 * option can be used to force further backtracking, but there is no
 * guarantee that it will produce a solution.