diff --git a/src/OpenFOAM/Make/files b/src/OpenFOAM/Make/files
index bf4c345bec..7e293fc7eb 100644
--- a/src/OpenFOAM/Make/files
+++ b/src/OpenFOAM/Make/files
@@ -164,11 +164,16 @@ $(functionEntries)/includeIfPresentEntry/includeIfPresentEntry.C
 $(functionEntries)/inputModeEntry/inputModeEntry.C
 $(functionEntries)/removeEntry/removeEntry.C
 
-calcEntry = $(functionEntries)/calcEntry
-$(calcEntry)/calcEntryParser.atg
-$(calcEntry)/calcEntryInternal.C
-$(calcEntry)/calcEntry.C
-
+/*
+ * Requires customized coco-cpp
+ * could be dropped or activated in the future
+ */
+/*
+  calcEntry = $(functionEntries)/calcEntry
+  $(calcEntry)/calcEntryParser.atg
+  $(calcEntry)/calcEntryInternal.C
+  $(calcEntry)/calcEntry.C
+*/
 
 IOdictionary = db/IOobjects/IOdictionary
 $(IOdictionary)/IOdictionary.C