diff --git a/src/Makefile.mingw b/src/Makefile.mingw
index b1f5ca1ce..82c68a108 100644
--- a/src/Makefile.mingw
+++ b/src/Makefile.mingw
@@ -59,6 +59,9 @@ endif
 ifndef USB
 USB	:= n
 endif
+ifndef DEV_BUILD
+DEV_BUILD := n
+endif
 ifndef DEV_BRANCH
 DEV_BRANCH := n
 endif
@@ -84,6 +87,13 @@ ifndef X64
 X64	:= n
 endif
 
+ifeq ($(DEV_BUILD), y)
+ DEV_BRANCH	:= y
+ CIRRUS	:= y
+ NV_RIVA	:= y
+ PAS16	:= y
+endif
+
 
 #########################################################################
 #		Nothing should need changing from here on..		#