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diff --git a/libc/sysdeps/linux/xtensa/bits/xtensa-config.h b/libc/sysdeps/linux/xtensa/bits/xtensa-config.h
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+/* Xtensa configuration settings.
+ Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006, 2007
+ Free Software Foundation, Inc.
+ Contributed by Bob Wilson (bwilson@tensilica.com) at Tensilica.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library 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
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, write to the Free
+ Software Foundation, Inc., 51 Franklin Street - Fifth Floor,
+ Boston, MA 02110-1301, USA. */
+
+#ifndef XTENSA_CONFIG_H
+#define XTENSA_CONFIG_H
+
+/* The macros defined here match those with the same names in the Xtensa
+ compile-time HAL (Hardware Abstraction Layer). Please refer to the
+ Xtensa System Software Reference Manual for documentation of these
+ macros. */
+
+/* The following macros reflect the default expectations for Xtensa
+ processor configurations that can run glibc. If you want to try
+ building glibc for an Xtensa configuration that is missing these
+ options, you will at least need to change the values of these
+ macros. */
+
+#undef XCHAL_HAVE_NSA
+#define XCHAL_HAVE_NSA 1
+
+#undef XCHAL_HAVE_LOOPS
+#define XCHAL_HAVE_LOOPS 1
+
+/* Assume the maximum number of AR registers. This currently only affects
+ the __window_spill function, and it is always safe to flush extra. */
+
+#undef XCHAL_NUM_AREGS
+#define XCHAL_NUM_AREGS 64
+
+/* Set a default page size. This is currently needed when bootstrapping
+ the runtime linker. See comments in dl-machine.h where this is used. */
+
+#undef XCHAL_MMU_MIN_PTE_PAGE_SIZE
+#define XCHAL_MMU_MIN_PTE_PAGE_SIZE 12
+
+#endif /* !XTENSA_CONFIG_H */