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

Calculating dependencies |
!!! Multiple versions within a single package slot have been pulled
!!! into the dependency graph, resulting in a slot conflict:

dev-lang/perl:0

  ('installed', '/', 'dev-lang/perl-5.8.8-r4', 'nomerge') pulled in by
    ('installed', '/', 'dev-perl/URI-1.35', 'nomerge')

  ('ebuild', '/', 'dev-lang/perl-5.10.0', 'merge') pulled in by
    ('installed', '/', 'app-office/gnumeric-1.8.2', 'nomerge')
    ('installed', '/', 'sys-devel/automake-1.10.1', 'nomerge')
    ('installed', '/', 'dev-perl/PlRPC-0.2020-r1', 'nomerge')
    (and 98 more)