Index: trunk/BNC/bnc.pro
===================================================================
--- trunk/BNC/bnc.pro	(revision 2899)
+++ trunk/BNC/bnc.pro	(revision 2900)
@@ -98,6 +98,8 @@
 QT += network
 
-DEFINES += USE_COMBINATION
-HEADERS += combination/bnccomb.h 
-SOURCES += combination/bnccomb.cpp
+exists(combination/bnccomp.h) {
+  DEFINES += USE_COMBINATION
+  HEADERS += combination/bnccomb.h 
+  SOURCES += combination/bnccomb.cpp
+}