diff --git a/lib/posix_wrap/errno.h b/lib/posix_wrap/errno.h
new file mode 100644
index 000000000..9031722e2
--- /dev/null
+++ b/lib/posix_wrap/errno.h
@@ -0,0 +1,28 @@
+/*
+ *  GRUB  --  GRand Unified Bootloader
+ *  Copyright (C) 2009, 2010  Free Software Foundation, Inc.
+ *
+ *  GRUB is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  GRUB is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with GRUB.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef GRUB_POSIX_ERRNO_H
+#define GRUB_POSIX_ERRNO_H	1
+
+#include <grub/err.h>
+
+#define errno  grub_errno
+#define EINVAL GRUB_ERR_BAD_NUMBER
+#define ENOMEM GRUB_ERR_OUT_OF_MEMORY
+
+#endif
diff --git a/lib/posix_wrap/unistd.h b/lib/posix_wrap/unistd.h
new file mode 100644
index 000000000..e69de29bb