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-rw-r--r--editor/specialty/ppmglobe.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/editor/specialty/ppmglobe.c b/editor/specialty/ppmglobe.c
index 92e22746..bb043cc6 100644
--- a/editor/specialty/ppmglobe.c
+++ b/editor/specialty/ppmglobe.c
@@ -9,7 +9,7 @@
  */
 
 
-#define _XOPEN_SOURCE  /* get M_PI in math.h */
+#define _XOPEN_SOURCE 500  /* get M_PI in math.h */
 #include <stdio.h>
 #include <stdlib.h>
 #include <unistd.h>