Index: Shared/NoWindows.h
--- Shared/NoWindows.h.orig
+++ Shared/NoWindows.h
@@ -38,8 +38,12 @@ typedef struct _GUID {
 #undef ZeroMemory
 #define ZeroMemory(POINTER, BYTES) memset(POINTER, 0, BYTES);
 
+#ifndef TRUE
 #define TRUE 1
+#endif
+#ifndef FALSE
 #define FALSE 0
+#endif
 
 #define CALLBACK