diff --git a/libc/include/errno.h b/libc/include/errno.h
new file mode 100644
index 0000000..2b2685a
--- /dev/null
+++ b/libc/include/errno.h
@@ -0,0 +1,55 @@
+/*
+ * Copyright (C) 2008 The Android Open Source Project
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *  * Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ *  * Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
+ * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+#ifndef _ERRNO_H
+#define _ERRNO_H
+
+#include <sys/cdefs.h>
+#include <linux/errno.h>
+
+__BEGIN_DECLS
+
+/* on Linux, ENOTSUP and EOPNOTSUPP are defined as the same error code
+ * even if 1000.3 states that they should be different
+ */
+#ifndef  ENOTUP
+#define  ENOTSUP  EOPNOTSUPP
+#endif
+
+/* internal function that should *only* be called from system calls */
+/* use errno = xxxx instead in C code                               */
+extern int    __set_errno(int  error);
+
+/* internal function returning the address of the thread-specific errno */
+extern volatile int*   __errno(void);
+
+/* a macro expanding to the errno l-value */
+#define  errno   (*__errno())
+
+__END_DECLS
+
+#endif /* _ERRNO_H */