diff --git a/src/Makefile b/src/Makefile
index 02d97d4a7..85f0bbd95 100644
--- a/src/Makefile
+++ b/src/Makefile
@@ -205,6 +205,10 @@ XCURVES = YES
 # Values = YES, NO
 GVARS = NO
 
+# Enable another 3 positions switch to replace a pot
+# Values = NO, POT1, POT2, POT3,
+3POS = NO
+
 #------- END BUILD OPTIONS ---------------------------
 
 # Define programs and commands.
@@ -714,6 +718,16 @@ ifeq ($(IRPROTOS), YES)
   CPPDEFS += -DIRPROTOS
 endif
 
+ifeq ($(3POS), POT1)
+  CPPDEFS += -DP13POS
+endif
+ifeq ($(3POS), POT2)
+  CPPDEFS += -DP23POS
+endif
+ifeq ($(3POS), POT3)
+  CPPDEFS += -DP33POS
+endif
+
 #---------------- Compiler Options C++ ----------------
 #  -g*:          generate debugging information
 #  -O*:          optimization level