--- eclass/meson.eclass
+++ eclass/meson.eclass
@@ -248,7 +248,7 @@
 	objcpp_args = $(_meson_env_array "${BUILD_OBJCXXFLAGS} ${BUILD_CPPFLAGS}")
 	objcpp_link_args = $(_meson_env_array "${BUILD_OBJCXXFLAGS} ${BUILD_LDFLAGS}")
 	needs_exe_wrapper = false
-	pkg_config_libdir = '${BUILD_PKG_CONFIG_LIBDIR:-${EPREFIX}/usr/$(get_libdir)/pkgconfig}'
+	pkg_config_libdir = '${BUILD_PKG_CONFIG_LIBDIR:-${EPREFIX}/usr/$(get_libdir $([[ $EAPI == 6 ]] || echo -b))/pkgconfig}'
 
 	[build_machine]
 	system = '${system}'
--- /usr/lib/portage/python3.8/phase-helpers.sh
+++ /usr/lib/portage/python3.8/phase-helpers.sh
@@ -940,12 +940,25 @@
 
 if ___eapi_has_get_libdir; then
 	get_libdir() {
-		local libdir_var="LIBDIR_${ABI}"
-		local libdir="lib"
+		local -a cmd=()
 
-		[[ -n ${ABI} && -n ${!libdir_var} ]] && libdir=${!libdir_var}
+		if [[ $1 = -b ]]; then
+			___eapi_best_version_and_has_version_support_-b_-d_-r ||
+			die "${FUNCNAME[1]}: option -b is not supported with EAPI ${EAPI}"
 
-		echo "${libdir}"
+			if ___eapi_has_prefix_variables; then
+				cmd+=(env -i PORTAGE_CONFIGROOT="/${PORTAGE_OVERRIDE_EPREFIX#/}")
+			else
+				cmd+=(env -i PORTAGE_CONFIGROOT=/)
+			fi
+		fi
+
+#		[[ -n $PORTAGE_IPC_DAEMON ]] && cmd+=("${PORTAGE_BIN_PATH}/ebuild-ipc") ||
+		cmd+=("${PORTAGE_BIN_PATH}/ebuild-helpers/portageq")
+
+		local abi=$("${cmd[@]}" envvar ABI 2>/dev/null)
+		local libdir_abi=$("${cmd[@]}" envvar "LIBDIR_${abi}" 2>/dev/null)
+		[[ -n ${abi} && -n ${libdir_abi} ]] && echo ${libdir_abi} || echo lib
 	}
 fi