Index: boot/generic/include/errno.h
===================================================================
--- boot/generic/include/errno.h	(revision d29ae353d74375e7338981290278a5217faf5170)
+++ boot/generic/include/errno.h	(revision fc448f5f560ea1a9a7e90a7dff181e501713aa1e)
@@ -40,4 +40,6 @@
 #define EOVERFLOW  -16  /* The result does not fit its size. */
 
+typedef int errno_t;
+
 #endif