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-rw-r--r--editor/pamaddnoise.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/editor/pamaddnoise.c b/editor/pamaddnoise.c
index cf1af815..354e0dc4 100644
--- a/editor/pamaddnoise.c
+++ b/editor/pamaddnoise.c
@@ -26,7 +26,7 @@
 ** Prentice Hall, 1993  ISBN 0-13-145814-0
 */
 
-#define _XOPEN_SOURCE   /* get M_PI in math.h */
+#define _XOPEN_SOURCE 500  /* get M_PI in math.h */
 
 #include <math.h>