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-rw-r--r--src/userdef.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/src/userdef.h b/src/userdef.h
index 612ff9d..0a113ee 100644
--- a/src/userdef.h
+++ b/src/userdef.h
@@ -8,7 +8,9 @@
typedef int INT; // 4 bytes
//typedef void * HANDLE;
+#ifndef NULL
#define NULL 0
+#endif
#ifdef IN
#undef IN