--- a/common/makefiles/MakeBase.gmk	Wed Jul 05 18:22:17 2017 +0200
+++ b/common/makefiles/MakeBase.gmk	Tue Sep 18 11:29:16 2012 -0700
@@ -138,7 +138,7 @@
 
 # Hook to be called as the very first thing when running a normal build
 define AtRootMakeStart
-	$(if $(findstring -j,$(MAKEFLAGS)), $(error make -j is not supported, use make JOBS=n))
+	$(if $(findstring --jobserver,$(MAKEFLAGS)), $(error make -j is not supported, use make JOBS=n))
 	$(call PrintStartMessage)
 	$(call StartTimer)
 endef