--- backends/aarch64_initreg.c	2017-03-08 17:45:48.694607265 +0100
+++ backends/aarch64_initreg.c	2017-03-08 17:49:45.939959063 +0100
@@ -31,6 +31,7 @@
 #endif
 
 #include "system.h"
+#include <sys/uio.h>
 #include <assert.h>
 #ifdef __aarch64__
 # include <sys/user.h>