diff --git a/sdk_container/src/third_party/portage-stable/eclass/flag-o-matic.eclass b/sdk_container/src/third_party/portage-stable/eclass/flag-o-matic.eclass
index c6b1ad80e1..02cd2dcfc5 100644
--- a/sdk_container/src/third_party/portage-stable/eclass/flag-o-matic.eclass
+++ b/sdk_container/src/third_party/portage-stable/eclass/flag-o-matic.eclass
@@ -10,14 +10,18 @@
 # This eclass contains a suite of functions to help developers sanely
 # and safely manage toolchain flags in their builds.
 
-case ${EAPI} in
-	6|7|8) ;;
-	*) die "${ECLASS}: EAPI ${EAPI:-0} not supported" ;;
-esac
-
 if [[ -z ${_FLAG_O_MATIC_ECLASS} ]]; then
 _FLAG_O_MATIC_ECLASS=1
 
+case ${EAPI} in
+	6)
+		ewarn "${CATEGORY}/${PF}: ebuild uses ${ECLASS} with deprecated EAPI ${EAPI}!"
+		ewarn "${CATEGORY}/${PF}: Support will be removed on 2024-10-08. Please port to newer EAPI."
+		;;
+	7|8) ;;
+	*) die "${ECLASS}: EAPI ${EAPI:-0} not supported" ;;
+esac
+
 inherit toolchain-funcs
 
 [[ ${EAPI} == 6 ]] && inherit eqawarn