src/*.c: Define _ISOC99_SOURCE and _POSIX_C_SOURCE in all .c files.

[sort-networks.git] / src / sn-evolution.c

diff --git a/src/sn-evolution.c b/src/sn-evolution.c
index b6c37b4..af48642 100644 (file)
--- a/src/sn-evolution.c
+++ b/src/sn-evolution.c
@@ -19,8 +19,12 @@
  *   Florian octo Forster <octo at verplant.org>
  **/
 
-#define _ISOC99_SOURCE
-#define _POSIX_C_SOURCE 200112L
+#ifndef _ISOC99_SOURCE
+# define _ISOC99_SOURCE
+#endif
+#ifndef _POSIX_C_SOURCE
+# define _POSIX_C_SOURCE 200112L
+#endif
 
 #include <stdlib.h>
 #include <stdio.h>