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-rw-r--r--generator/pamshadedrelief.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/generator/pamshadedrelief.c b/generator/pamshadedrelief.c
index 89996c83..35d1e3e0 100644
--- a/generator/pamshadedrelief.c
+++ b/generator/pamshadedrelief.c
@@ -38,7 +38,7 @@
    edge.
 */
 
-#define _XOPEN_SOURCE   /* get M_PI in math.h */
+#define _XOPEN_SOURCE 500  /* get M_PI in math.h */
 
 #include <assert.h>
 #include <math.h>