--- a/common/autoconf/spec.gmk.in	Wed Sep 23 10:17:38 2015 +0200
+++ b/common/autoconf/spec.gmk.in	Fri Sep 25 08:43:21 2015 +0200
@@ -36,6 +36,11 @@
 # A self-referential reference to this file.
 SPEC:=@SPEC@
 
+# SPACE is defined in MakeBase.gmk, but it is also used in := rules here for some
+# toolchains, and is needed if MakeBase.gmk is not included before this file.
+X:=
+SPACE:=$(X) $(X)
+
 # What make to use for main processing, after bootstrapping top-level Makefile.
 MAKE := @MAKE@