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-rw-r--r--generator/ppmforge.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/generator/ppmforge.c b/generator/ppmforge.c
index 8ea86429..390180e3 100644
--- a/generator/ppmforge.c
+++ b/generator/ppmforge.c
@@ -31,7 +31,7 @@
 
 */
 
-#define _XOPEN_SOURCE   /* get M_PI in math.h */
+#define _XOPEN_SOURCE 500  /* get M_PI in math.h */
 
 #include <math.h>
 #include <assert.h>