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-rw-r--r--converter/ppm/ppmtompeg/jrevdct.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/converter/ppm/ppmtompeg/jrevdct.c b/converter/ppm/ppmtompeg/jrevdct.c
index f7b32192..dd1f9fff 100644
--- a/converter/ppm/ppmtompeg/jrevdct.c
+++ b/converter/ppm/ppmtompeg/jrevdct.c
@@ -26,7 +26,7 @@
  * matrix, perhaps with the difference cases encoded.
  */
 
-#define _XOPEN_SOURCE  /* Make sure M_PI is in math.h */
+#define _XOPEN_SOURCE 500  /* get M_PI in math.h */
 
 #include <memory.h>
 #include <math.h>