Index: uspace/lib/c/include/errno.h
===================================================================
--- uspace/lib/c/include/errno.h	(revision 4c6de4fedd187a7892fc56495e5fedb52f123582)
+++ uspace/lib/c/include/errno.h	(revision 7f11dc6ba31c85d4b1daa9c4ebd4d6f99082a87c)
@@ -36,4 +36,6 @@
 #define LIBC_ERRNO_H_
 
+typedef int errno_t;
+
 #include <abi/errno.h>