diff --git a/configure/E3/RULES_E3 b/configure/E3/RULES_E3
index e3dff1b04af06282bada0d1b8628c04f49e83e01..5b5f3afc45e3137a3f5ac8c75319c38b4ebf6ac7 100644
--- a/configure/E3/RULES_E3
+++ b/configure/E3/RULES_E3
@@ -1,3 +1,6 @@
+# -*- mode: Makefile;-*-
+.NOTPARALLEL:
+
 .DEFAULT_GOAL := help
 
 .PHONY: help default install uninstall build rebuild clean conf
diff --git a/configure/modules/RULES_E3 b/configure/modules/RULES_E3
index 4bc23e07f552bae095189c0e5aa2edad02098684..faffd3482eeb5fae16597d44b455d2fbd8dc30d6 100644
--- a/configure/modules/RULES_E3
+++ b/configure/modules/RULES_E3
@@ -1,3 +1,6 @@
+# -*- mode: Makefile;-*-
+.NOTPARALLEL:
+
 .DEFAULT_GOAL := help
 
 .PHONY: help default install uninstall build rebuild clean conf