app-admin/logmon: fix build w/ clang 16

Closes: https://bugs.gentoo.org/894206
Signed-off-by: Sam James <[email protected]>

app-admin/logmon/logmon-0.4.4-r1.ebuild

@@ -1,9 +1,9 @@
-# Copyright 1999-2021 Gentoo Authors
+# Copyright 1999-2023 Gentoo Authors
 # Distributed under the terms of the GNU General Public License v2
 
 EAPI=7
 
-inherit autotools
+inherit autotools flag-o-matic
 
 MY_P="LogMon-${PV}"
 DESCRIPTION="Split-screen terminal/ncurses based log viewer"
@@ -38,6 +38,13 @@ src_prepare() {
 	eautoreconf
 }
 
+src_configure() {
+	# Uses removed 'register' keyword, bug #894206
+	append-cxxflags -std=c++14
+
+	econf
+}
+
 src_install() {
 	dobin logmon