Makefile options and letters added

# Enable Extended vario functions (V4 board only)
# Values = YES, NO
VARIO_EXTENDED = NO

and
${MODS}V

src/Makefile

@@ -83,6 +83,10 @@ DISPLAY_USER_DATA = NO
 # Values = YES, NO
 FRSKY_HUB = YES
 
+# Enable Extended vario functions (V4 board only)
+# Values = YES, NO
+VARIO_EXTENDED = NO
+
 # WS HowHigh 
 # Values = YES, NO
 WS_HOW_HIGH = YES
@@ -329,6 +333,11 @@ ifeq ($(PCB), V4)
     CPPDEFS += -DEXTRA_ROTARY_ENCODERS
     MODS:=${MODS}X
   endif
+
+  ifeq ($(VARIO_EXTENDED), YES)
+    CPPDEFS += -DVARIO_EXTENDED
+    MODS:=${MODS}V
+  endif
   
 endif