Protect NDEBUG in case already defined

diff --git a/lib/sparse/general.h b/lib/sparse/general.h
index f8996e526ecd770b356cfea229f1cd6c01983ffb..d62c318fd0f0337f215ff1779c9022582f44834a 100644 (file)
--- a/lib/sparse/general.h
+++ b/lib/sparse/general.h
@@ -74,8 +74,10 @@ extern unsigned char Verbose;
 #define MEMCPY memcpy
 
 #ifndef DEBUG
+#ifndef NDEBUG
 #define NDEBUG /* switch off assert*/
 #endif
+#endif
 
 #ifdef DEBUG
 extern double _statistics[10];