diff --git a/.gitignore b/.gitignore
index 722303bd5..668630512 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,4 @@
+.arlock
 .depend
 Make.dep
 *.o
diff --git a/Application.mk b/Application.mk
index 25af1926e..641e89b85 100644
--- a/Application.mk
+++ b/Application.mk
@@ -130,9 +130,9 @@ $(CXXOBJS): %$(SUFFIX)$(OBJEXT): %$(CXXEXT)
 
 .built: $(OBJS)
 ifeq ($(WINTOOL),y)
-	$(call ARCHIVE, "${shell cygpath -w $(BIN)}", $(OBJS))
+	$(call ARLOCK, "${shell cygpath -w $(BIN)}", $(OBJS))
 else
-	$(call ARCHIVE, $(BIN), $(OBJS))
+	$(call ARLOCK, $(BIN), $(OBJS))
 endif
 	$(Q) touch $@
 
diff --git a/Make.defs b/Make.defs
index 77b0c8275..89a649b39 100644
--- a/Make.defs
+++ b/Make.defs
@@ -52,7 +52,7 @@ CLEANDIRS := $(dir $(wildcard $(APPDIR)$(DELIM)*$(DELIM)Makefile))
 CONFIGURED_APPS :=
 
 define Add_Application
-  include $(1)Make.defs
+	include $(1)Make.defs
 endef
 
 $(foreach BDIR, $(BUILDIRS), $(eval $(call Add_Application,$(BDIR))))
@@ -99,6 +99,10 @@ define REGISTER
 endef
 endif
 
+define ARLOCK
+	$(Q) flock .arlock $(call ARCHIVE, $1, $(2))
+endef
+
 # Tools
 
 ifeq ($(DIRLINK),)
diff --git a/Makefile b/Makefile
index e0ad31f1c..dfb9da882 100644
--- a/Makefile
+++ b/Makefile
@@ -117,9 +117,9 @@ $(SYMTABOBJ): %$(OBJEXT): %.c
 
 $(BIN): $(SYMTABOBJ)
 ifeq ($(WINTOOL),y)
-	$(call ARCHIVE, "${shell cygpath -w $(BIN)}", $^)
+	$(call ARLOCK, "${shell cygpath -w $(BIN)}", $^)
 else
-	$(call ARCHIVE, $(BIN), $^)
+	$(call ARLOCK, $(BIN), $^)
 endif
 
 endif # !CONFIG_BUILD_LOADABLE
@@ -198,6 +198,7 @@ else
 		fi; \
 	)
 endif
+	$(call DELFILE, .arlock)
 	$(call DELFILE, .depend)
 	$(call DELFILE, $(SYMTABSRC))
 	$(call DELFILE, $(SYMTABOBJ))