diff --git a/sdk_container/src/third_party/portage-stable/eclass/optfeature.eclass b/sdk_container/src/third_party/portage-stable/eclass/optfeature.eclass
index 250a995901..b44fc1b852 100644
--- a/sdk_container/src/third_party/portage-stable/eclass/optfeature.eclass
+++ b/sdk_container/src/third_party/portage-stable/eclass/optfeature.eclass
@@ -1,23 +1,21 @@
-# Copyright 1999-2021 Gentoo Authors
+# Copyright 1999-2022 Gentoo Authors
 # Distributed under the terms of the GNU General Public License v2
 
-# Flatcar: Support EAPI 0, 4 and 5.
-
 # @ECLASS: optfeature.eclass
 # @MAINTAINER:
 # base-system@gentoo.org
-# @SUPPORTED_EAPIS: 0 4 5 6 7 8
+# @SUPPORTED_EAPIS: 7 8
 # @BLURB: Advertise optional functionality that might be useful to users
 
-case ${EAPI:-0} in
-	0|4|5|6|7|8) ;;
+case ${EAPI} in
+	7|8) ;;
 	*) die "${ECLASS}: EAPI=${EAPI:-0} is not supported" ;;
 esac
 
 if [[ -z ${_OPTFEATURE_ECLASS} ]]; then
 _OPTFEATURE_ECLASS=1
 
-# @ECLASS-VARIABLE: _OPTFEATURE_DEFAULT_HEADER
+# @ECLASS_VARIABLE: _OPTFEATURE_DEFAULT_HEADER
 # @INTERNAL
 # @DESCRIPTION:
 # Default header printed ahead of optfeature output. Can be overridden
@@ -27,7 +25,7 @@ _OPTFEATURE_DEFAULT_HEADER="Install additional packages for optional runtime fea
 
 readonly _OPTFEATURE_DEFAULT_HEADER
 
-# @ECLASS-VARIABLE: _OPTFEATURE_HEADER
+# @ECLASS_VARIABLE: _OPTFEATURE_HEADER
 # @INTERNAL
 # @DESCRIPTION:
 # Default empty. Custom header printed ahead of optfeature output.
@@ -36,7 +34,7 @@ readonly _OPTFEATURE_DEFAULT_HEADER
 # dependencies are present.
 _OPTFEATURE_HEADER=
 
-# @ECLASS-VARIABLE: _OPTFEATURE_DOHEADER
+# @ECLASS_VARIABLE: _OPTFEATURE_DOHEADER
 # @INTERNAL
 # @DESCRIPTION:
 # If true, print header ahead of the first optfeature output.