Index: lib/libutil/asprintf.c
--- lib/libutil/asprintf.c.orig
+++ lib/libutil/asprintf.c
@@ -1,4 +1,3 @@
-#define _XOPEN_SOURCE 600  /* Make sure strdup() is in <string.h> */
 #define _GNU_SOURCE  /* But only when HAVE_ASPRINTF */
 #include <stdarg.h>
 #include <stdio.h>