Index: trunk/psModules/src/extras/Makefile.am
===================================================================
--- trunk/psModules/src/extras/Makefile.am	(revision 27746)
+++ trunk/psModules/src/extras/Makefile.am	(revision 27750)
@@ -17,4 +17,5 @@
 	pmKapaPlots.h \
 	pmVisual.h \
+	ippDiffMode.h \
 	ippStages.h
 
Index: trunk/psModules/src/extras/ippDiffMode.h
===================================================================
--- trunk/psModules/src/extras/ippDiffMode.h	(revision 27750)
+++ trunk/psModules/src/extras/ippDiffMode.h	(revision 27750)
@@ -0,0 +1,20 @@
+/* @file ippStages.h
+ * @brief some macro defintions for the stages of the pipeline
+ * @author Bill Sweeney, IfA
+ *
+ * Copyright 2010 Institute for Astronomy, University of Hawaii
+ */
+
+#ifndef IPP_DIFF_MODE_H
+#define IPP_DIFF_MODE_H
+
+typedef enum {
+    IPP_DIFF_MODE_UNDEFINED   = 0,
+    IPP_DIFF_MODE_WARP_WARP   = 1,
+    IPP_DIFF_MODE_WARP_STACK  = 2,
+    IPP_DIFF_MODE_STACK_WARP  = 3,
+    IPP_DIFF_MODE_STACK_STACK = 4
+} ippDiffMode;
+
+
+#endif
Index: trunk/psModules/src/extras/ippStages.h
===================================================================
--- trunk/psModules/src/extras/ippStages.h	(revision 27746)
+++ trunk/psModules/src/extras/ippStages.h	(revision 27750)
@@ -1,3 +1,3 @@
-/* @file psVisual.h
+/* @file ippStages.h
  * @brief some macro defintions for the stages of the pipeline
  * @author Bill Sweeney, IfA
Index: trunk/psModules/src/psmodules.h
===================================================================
--- trunk/psModules/src/psmodules.h	(revision 27746)
+++ trunk/psModules/src/psmodules.h	(revision 27750)
@@ -10,4 +10,6 @@
 #include <pmKapaPlots.h>
 #include <pmVisual.h>
+#include <ippStages.h>
+#include <ippDiffMode.h>
 
 // XXX the following headers define constructs needed by the elements below