diff -r a05ed58d5ae0 -r 2209644bcac4 common/autoconf/spec.gmk.in
--- a/common/autoconf/spec.gmk.in	Sat Apr 07 03:28:39 2018 -0700
+++ b/common/autoconf/spec.gmk.in	Tue Apr 10 07:46:25 2018 -0700
@@ -46,6 +46,9 @@
 
 endef
 
+# The command line given to configure.
+CONFIGURE_COMMAND_LINE:=@CONFIGURE_COMMAND_LINE@
+
 # A self-referential reference to this file.
 SPEC:=@SPEC@