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-rw-r--r--lib/libppmcolor.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/libppmcolor.c b/lib/libppmcolor.c
index 36eb7a3f..3e7bf27c 100644
--- a/lib/libppmcolor.c
+++ b/lib/libppmcolor.c
@@ -10,7 +10,7 @@
 */
 
 #define _BSD_SOURCE 1      /* Make sure strdup() is in string.h */
-#define _XOPEN_SOURCE 500  /* Make sure strdup() is in string.h */
+#define _XOPEN_SOURCE 600  /* Make sure strdup() is in string.h */
 
 #include <assert.h>
 #include <stdlib.h>