--- gcc-6.3.0/libgfortran/io/close.c.org	2017-01-17 09:43:48.395850000 +0100
+++ gcc-6.3.0/libgfortran/io/close.c	2017-01-17 09:21:05.000000000 +0100
@@ -25,6 +25,7 @@
 #include "io.h"
 #include "unix.h"
 #include <limits.h>
+#include <stdlib.h>
 
 typedef enum
 { CLOSE_DELETE, CLOSE_KEEP, CLOSE_UNSPECIFIED }