added NULL define in debug.h

diff --git a/lib/include/bear/debug.h b/lib/include/bear/debug.h
index fb5ac94..446151f 100644 (file)
--- a/lib/include/bear/debug.h
+++ b/lib/include/bear/debug.h
@@ -19,6 +19,11 @@
 #define DEBUG_H
 
 
+#ifndef NULL
+#define NULL 0
+#endif
+
+
 namespace bear
 {