--- src/builtin.c.orig	2019-05-10 02:29:13 +0000
+++ src/builtin.c	2019-05-10 02:31:12 +0000
@@ -1,7 +1,11 @@
 #define _BSD_SOURCE
 #define _GNU_SOURCE
 #ifndef __sun__
+#if defined(_AIX)       /* AIX */
+#define _XOPEN_SOURCE 600
+#elif
 # define _XOPEN_SOURCE
+#endif   /* _AIX */
 # define _XOPEN_SOURCE_EXTENDED 1
 #else
 # define _XPG6