Index: /trunk/ippconfig/recipes/ppSub.config
===================================================================
--- /trunk/ippconfig/recipes/ppSub.config	(revision 24281)
+++ /trunk/ippconfig/recipes/ppSub.config	(revision 24282)
@@ -44,4 +44,5 @@
 INTERPOLATION	STR	LANCZOS3	# Interpolation mode for bad pixels
 
+DUAL		BOOL	FALSE		# Dual convolution?
 INVERSE		BOOL	FALSE		# Generate inverse subtraction?
 PHOTOMETRY	BOOL	FALSE		# Perform photometry?