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-rw-r--r--editor/pnmrotate.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/editor/pnmrotate.c b/editor/pnmrotate.c
index da5de3a8..44952a59 100644
--- a/editor/pnmrotate.c
+++ b/editor/pnmrotate.c
@@ -10,7 +10,7 @@
 ** implied warranty.
 */
 
-#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>