--- mongodb-2.2.1.ebuild
+++ mongodb-2.2.1.ebuild
@@ -58,6 +58,7 @@
 	epatch "${FILESDIR}/${PN}-2.2-r1-fix-scons.patch"
 	epatch "${FILESDIR}/${PN}-2.2-r1-fix-boost.patch"
 	epatch "${FILESDIR}/${PN}-2.2-r2-boost-1.50.patch"
+	epatch "${FILESDIR}/${P}-c++11.patch"
 
 	# FIXME: apply only this fix [1] on x86 boxes as it breaks /usr/lib symlink
 	# on amd64 machines [2].
@@ -68,6 +69,12 @@
 	fi
 }
 
+src_configure() {
+	if has_version "dev-libs/boost[c++11(-)]"; then
+		append-cxxflags -std=c++11
+	fi
+}
+
 src_compile() {
 	escons ${scons_opts} all
 }