Similar to e.g. bug #675218, it appears so unless there's something specific to this package which I doubt. /usr/sbin/nagios requires libltdl.so.7, which is provided by dev-libs/libltdl, not sys-devel/libtool. It works because sys-devel/libtool has a rdepend on the library provided but it doesn't seem correct.
The bug has been closed via the following commit(s): https://gitweb.gentoo.org/repo/gentoo.git/commit/?id=f56ca9245195c4370eb715639a9e412e272d1d39 commit f56ca9245195c4370eb715639a9e412e272d1d39 Author: Michael Orlitzky <mjo@gentoo.org> AuthorDate: 2019-01-18 23:39:42 +0000 Commit: Michael Orlitzky <mjo@gentoo.org> CommitDate: 2019-01-18 23:52:58 +0000 net-analyzer/nagios-core: new version 4.4.3. This is a standard version bump, but also fixes a dependency on sys-devel/libtool that should have been dev-libs/libltdl all along. Since "--enable-event-broker" is enabled by default, the configure script looks for and links against libltdl. Thanks are due to Sławomir Nizio for noticing the bug. Closes: https://bugs.gentoo.org/675226 Signed-off-by: Michael Orlitzky <mjo@gentoo.org> Package-Manager: Portage-2.3.51, Repoman-2.3.11 net-analyzer/nagios-core/Manifest | 1 + net-analyzer/nagios-core/nagios-core-4.4.3.ebuild | 213 ++++++++++++++++++++++ 2 files changed, 214 insertions(+)