Created attachment 427936 [details] bind-tools-9.10.3_p4:build.log Looks like a naming issue - ebuild is looking for bind-tools-9.10.3_p4-libressl.patch, however ${FILESDIR} contains bind-tools-9.10.3_p2-libressl.patch.
I can confirm.
commit 9d8f714441e595d47c7672e45934877fadc05273 Author: Patrick Lauer <patrick@gentoo.org> Date: Fri Mar 11 11:04:02 2016 +0100 net-dns/bind-tools: Fix patch name #577006 Package-Manager: portage-2.2.27 diff --git a/net-dns/bind-tools/bind-tools-9.10.3_p4.ebuild b/net-dns/bind-tools/bind-tools-9.10.3_p4.ebuild index 08d7816..65e0a87 100644 --- a/net-dns/bind-tools/bind-tools-9.10.3_p4.ebuild +++ b/net-dns/bind-tools/bind-tools-9.10.3_p4.ebuild @@ -47,7 +47,7 @@ RESTRICT="test" src_prepare() { epatch "${FILESDIR}"/${PN}-9.5.0_p1-lwconfig.patch #231247 epatch "${FILESDIR}"/${PN}-9.10.2-openssl.patch #417129 - epatch "${FILESDIR}"/${P}-libressl.patch #563648 + epatch "${FILESDIR}"/${PN}-9.10.3_p2-libressl.patch #563648 # Disable tests for now, bug 406399 sed -i '/^SUBDIRS/s:tests::' bin/Makefile.in lib/Makefile.in || die
*** Bug 577052 has been marked as a duplicate of this bug. ***