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diff --git a/sysdeps/generic/bits/endian.h b/sysdeps/generic/bits/endian.h
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+/* This file should define __BYTE_ORDER as appropriate for the machine
+ in question. See string/endian.h for how to define it.
+
+ If only the stub bits/endian.h applies to a particular configuration,
+ bytesex.h is generated by running a program on the host machine.
+ So if cross-compiling to a machine with a different byte order,
+ the bits/endian.h file for that machine must exist. */
+
+#error Machine byte order unknown.