games-arcade/criticalmass: Fix building with GCC-6

Bug: https://bugs.gentoo.org/show_bug.cgi?id=612758
Package-Manager: Portage-2.3.6, Repoman-2.3.2
Closes: gentoo#5156

games-arcade/criticalmass/criticalmass-1.0.2.ebuild

@@ -1,8 +1,8 @@
-# Copyright 1999-2015 Gentoo Foundation
+# Copyright 1999-2017 Gentoo Foundation
 # Distributed under the terms of the GNU General Public License v2
 
 EAPI=5
-inherit autotools eutils games
+inherit autotools eutils flag-o-matic games
 
 DESCRIPTION="SDL/OpenGL space shoot'em up game"
 HOMEPAGE="http://criticalmass.sourceforge.net/"
@@ -32,6 +32,11 @@ src_prepare() {
 	eautoreconf
 }
 
+src_configure() {
+	append-cxxflags -std=gnu++98 # Bug 612758
+	default
+}
+
 src_install() {
 	default
 	rm -f "${D}${GAMES_BINDIR}/Packer"