--- gcc-5.4.0/libgfortran/intrinsics/chmod.c.orig	2016-12-18 10:38:13.034904609 +0100
+++ gcc-5.4.0/libgfortran/intrinsics/chmod.c	2016-12-18 10:38:15.398237920 +0100
@@ -30,6 +30,9 @@
 #include <string.h>	/* For memcpy. */
 #include <stdlib.h>	/* For free.  */
 #include <sys/stat.h>	/* For stat, chmod and umask.  */
+#ifdef __MINGW32__
+#include <io.h>
+#endif
 
 
 /* INTEGER FUNCTION CHMOD (NAME, MODE)