Declared as a requirement by dev-perl/Growl-GNTP
which shipped 2 releases explicitly to add the missing dependency.
( Related: https://github.com/mattn/p5-Growl-GNTP/issues/6 )
Package-Manager: portage-2.2.28
--- /dev/null
+# Copyright 1999-2016 Gentoo Foundation
+# Distributed under the terms of the GNU General Public License v2
+# $Id$
+
+EAPI=6
+
+DIST_AUTHOR=DMUEY
+DIST_VERSION=0.03
+inherit perl-module
+
+DESCRIPTION="Perl extension for checking the open or closed status of a port"
+SLOT="0"
+KEYWORDS="~amd64 ~x86"
+IUSE="test"
+
+RDEPEND="virtual/perl-IO"
+DEPEND="${RDEPEND}
+ virtual/perl-ExtUtils-MakeMaker
+ test? ( virtual/perl-Test-Simple )"
--- /dev/null
+DIST IO-Socket-PortState-0.03.tar.gz 3380 SHA256 9b6272699d2afd6f65aaa118e2613da28a9f3ba7a80c30bd0cfb16619db131bc SHA512 84353b041558b5401f207d350b66ef696a9f3b23bddb845da76a98b072fe64f9761eb9f10e797744b5241d5eac606769ecc24cdfefb16669f446cf21968220e4 WHIRLPOOL 65dca6d2719d8446161f2b0ad85d6a08f63658039fb98aeb9883ed7ff731080c4b841b7966c3ed5549bad20bc0a94eec8c19ef25e3ab07d3a06aab23b5bd99b9
--- /dev/null
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE pkgmetadata SYSTEM "http://www.gentoo.org/dtd/metadata.dtd">
+<pkgmetadata>
+ <maintainer type="project">
+ <email>perl@gentoo.org</email>
+ <name>Gentoo Perl Project</name>
+ </maintainer>
+ <upstream>
+ <remote-id type="cpan">IO-Socket-PortState</remote-id>
+ <remote-id type="cpan-module">IO::Socket::PortState</remote-id>
+ </upstream>
+</pkgmetadata>