diff --git a/extras/httpd/httpd.c b/extras/httpd/httpd.c
index 253bc13..fcbc290 100644
--- a/extras/httpd/httpd.c
+++ b/extras/httpd/httpd.c
@@ -139,7 +139,7 @@
 
 /** Set this to 1 on platforms where strnstr is not available */
 #ifndef LWIP_HTTPD_STRNSTR_PRIVATE
-#define LWIP_HTTPD_STRNSTR_PRIVATE          1
+#define LWIP_HTTPD_STRNSTR_PRIVATE          0
 #endif
 
 /** Set this to one to show error pages when parsing a request fails instead
diff --git a/extras/sntp/sntp_fun.c b/extras/sntp/sntp_fun.c
index 7aaca20..96e8ffc 100644
--- a/extras/sntp/sntp_fun.c
+++ b/extras/sntp/sntp_fun.c
@@ -102,7 +102,7 @@ void sntp_update_rtc(time_t t, uint32_t us) {
 	// DEBUG: Compute and print drift
 	int64_t sntp_current = sntp_base + TIMER_COUNT - tim_ref;
 	int64_t sntp_correct = (((uint64_t)us + (uint64_t)t * 1000000U)<<12) / cal;
-	printf("\nRTC Adjust: drift = %ld ticks, cal = %d\n", (time_t)(sntp_correct - sntp_current), cal);
+	printf("\nRTC Adjust: drift = %lld ticks, cal = %d\n", (time_t)(sntp_correct - sntp_current), (uint32_t)cal);
 
 	tim_ref = TIMER_COUNT;
 	cal = sdk_system_rtc_clock_cali_proc();
diff --git a/libc/README.md b/libc/README.md
index 50a299a..f4d8199 100644
--- a/libc/README.md
+++ b/libc/README.md
@@ -1 +1 @@
-Newlib from git://sourceware.org/git/newlib-cygwin.git with xtensa & locking patches see https://github.com/ourairquality/newlib and built from commit cca8337a4eff8d590c54ce0a9cf335041d949296
+Newlib from git://sourceware.org/git/newlib-cygwin.git with xtensa & locking patches see https://github.com/ourairquality/newlib and built from commit 7bcbbff5f7e3600806f352e88ec23ae0300edc29
diff --git a/libc/xtensa-lx106-elf/include/inttypes.h b/libc/xtensa-lx106-elf/include/inttypes.h
index 25c6e99..694ba8f 100644
--- a/libc/xtensa-lx106-elf/include/inttypes.h
+++ b/libc/xtensa-lx106-elf/include/inttypes.h
@@ -16,10 +16,15 @@
 #include <newlib.h>
 #include <sys/config.h>
 #include <sys/_intsup.h>
+#include "_ansi.h"
 #include <stdint.h>
 #define __need_wchar_t
 #include <stddef.h>
 
+#if __BSD_VISIBLE
+#include <xlocale.h>
+#endif
+
 #define __STRINGIFY(a) #a
 
 /* 8-bit types */
@@ -309,6 +314,8 @@ typedef struct {
   intmax_t	rem;
 } imaxdiv_t;
 
+struct _reent;
+
 #ifdef __cplusplus
 extern "C" {
 #endif
@@ -316,9 +323,20 @@ extern "C" {
 extern intmax_t  imaxabs(intmax_t j);
 extern imaxdiv_t imaxdiv(intmax_t numer, intmax_t denomer);
 extern intmax_t  strtoimax(const char *__restrict, char **__restrict, int);
+extern intmax_t  _strtoimax_r(struct _reent *, const char *__restrict, char **__restrict, int);
 extern uintmax_t strtoumax(const char *__restrict, char **__restrict, int);
+extern uintmax_t _strtoumax_r(struct _reent *, const char *__restrict, char **__restrict, int);
 extern intmax_t  wcstoimax(const wchar_t *__restrict, wchar_t **__restrict, int);
+extern intmax_t  _wcstoimax_r(struct _reent *, const wchar_t *__restrict, wchar_t **__restrict, int);
 extern uintmax_t wcstoumax(const wchar_t *__restrict, wchar_t **__restrict, int);
+extern uintmax_t _wcstoumax_r(struct _reent *, const wchar_t *__restrict, wchar_t **__restrict, int);
+
+#if __BSD_VISIBLE
+extern intmax_t  strtoimax_l(const char *__restrict, char **_restrict, int, locale_t);
+extern uintmax_t strtoumax_l(const char *__restrict, char **_restrict, int, locale_t);
+extern intmax_t  wcstoimax_l(const wchar_t *__restrict, wchar_t **_restrict, int, locale_t);
+extern uintmax_t wcstoumax_l(const wchar_t *__restrict, wchar_t **_restrict, int, locale_t);
+#endif
 
 #ifdef __cplusplus
 }
diff --git a/libc/xtensa-lx106-elf/include/machine/ieeefp.h b/libc/xtensa-lx106-elf/include/machine/ieeefp.h
index d3c6905..23c03a7 100644
--- a/libc/xtensa-lx106-elf/include/machine/ieeefp.h
+++ b/libc/xtensa-lx106-elf/include/machine/ieeefp.h
@@ -170,6 +170,10 @@
 #define __IEEE_LITTLE_ENDIAN
 #endif
 
+#ifdef __riscv
+#define __IEEE_LITTLE_ENDIAN
+#endif
+
 #ifdef __i960__
 #define __IEEE_LITTLE_ENDIAN
 #endif
diff --git a/libc/xtensa-lx106-elf/include/machine/setjmp.h b/libc/xtensa-lx106-elf/include/machine/setjmp.h
index d1bd78e..d93636b 100644
--- a/libc/xtensa-lx106-elf/include/machine/setjmp.h
+++ b/libc/xtensa-lx106-elf/include/machine/setjmp.h
@@ -385,6 +385,15 @@ _BEGIN_STD_C
 #define _JBLEN 12
 #endif
 
+#ifdef __riscv
+#define _JBTYPE long
+#ifdef __riscv_32e
+#define _JBLEN ((4*sizeof(long))/sizeof(long))
+#else
+#define _JBLEN ((14*sizeof(long) + 12*sizeof(double))/sizeof(long))
+#endif
+#endif
+
 #ifdef _JBLEN
 #ifdef _JBTYPE
 typedef	_JBTYPE jmp_buf[_JBLEN];
@@ -395,7 +404,7 @@ typedef	int jmp_buf[_JBLEN];
 
 _END_STD_C
 
-#if defined(__CYGWIN__) || defined(__rtems__)
+#if (defined(__CYGWIN__) || defined(__rtems__)) && __POSIX_VISIBLE
 #include <signal.h>
 
 #ifdef __cplusplus
@@ -477,4 +486,4 @@ extern int _setjmp (jmp_buf);
 #ifdef __cplusplus
 }
 #endif
-#endif /* __CYGWIN__ or __rtems__ */
+#endif /* (__CYGWIN__ or __rtems__) and __POSIX_VISIBLE */
diff --git a/libc/xtensa-lx106-elf/include/machine/time.h b/libc/xtensa-lx106-elf/include/machine/time.h
index 6f9a35c..c75edaf 100644
--- a/libc/xtensa-lx106-elf/include/machine/time.h
+++ b/libc/xtensa-lx106-elf/include/machine/time.h
@@ -1,7 +1,7 @@
 #ifndef	_MACHTIME_H_
 #define	_MACHTIME_H_
 
-#if defined(__rtems__) || defined(__VISIUM__)
+#if defined(__rtems__) || defined(__VISIUM__) || defined(__riscv)
 #define _CLOCKS_PER_SEC_ 1000000
 #elif defined(__aarch64__) || defined(__arm__) || defined(__thumb__)
 #define _CLOCKS_PER_SEC_ 100
diff --git a/libc/xtensa-lx106-elf/include/newlib.h b/libc/xtensa-lx106-elf/include/newlib.h
index 65b6e90..f4dd838 100644
--- a/libc/xtensa-lx106-elf/include/newlib.h
+++ b/libc/xtensa-lx106-elf/include/newlib.h
@@ -91,6 +91,9 @@
 /* Define if using retargetable functions for default lock routines.  */
 /* #undef _RETARGETABLE_LOCKING */
 
+/* Define to use type long for time_t.  */
+/* #undef _WANT_USE_LONG_TIME_T */
+
 /*
  * Iconv encodings enabled ("to" direction)
  */
diff --git a/libc/xtensa-lx106-elf/include/stdio.h b/libc/xtensa-lx106-elf/include/stdio.h
index 1c32423..ee0f612 100644
--- a/libc/xtensa-lx106-elf/include/stdio.h
+++ b/libc/xtensa-lx106-elf/include/stdio.h
@@ -384,6 +384,9 @@ int	_EXFUN(vdprintf, (int, const char *__restrict, __VALIST)
 #endif
 #if __ATFILE_VISIBLE
 int	_EXFUN(renameat, (int, const char *, int, const char *));
+# ifdef __CYGWIN__
+int	_EXFUN(renameat2, (int, const char *, int, const char *, unsigned int));
+# endif
 #endif
 
 /*
@@ -735,12 +738,35 @@ _ELIDABLE_INLINE int __sputc_r(struct _reent *_ptr, int _c, FILE *_p) {
 #define	fileno(p)	__sfileno(p)
 #endif
 
-#ifndef __CYGWIN__
-#ifndef lint
-#define	getc(fp)	__sgetc_r(_REENT, fp)
-#define putc(x, fp)	__sputc_r(_REENT, x, fp)
-#endif /* lint */
-#endif /* __CYGWIN__ */
+static __inline int
+_getchar_unlocked(void)
+{
+	struct _reent *_ptr;
+
+	_ptr = _REENT;
+	return (__sgetc_r(_ptr, _stdin_r(_ptr)));
+}
+
+static __inline int
+_putchar_unlocked(int _c)
+{
+	struct _reent *_ptr;
+
+	_ptr = _REENT;
+	return (__sputc_r(_ptr, _c, _stdout_r(_ptr)));
+}
+
+#ifdef __SINGLE_THREAD__
+#define	getc(_p)	__sgetc_r(_REENT, _p)
+#define	putc(_c, _p)	__sputc_r(_REENT, _c, _p)
+#define	getchar()	_getchar_unlocked()
+#define	putchar(_c)	_putchar_unlocked(_c)
+#endif /* __SINGLE_THREAD__ */
+
+#if __MISC_VISIBLE || __POSIX_VISIBLE
+#define	getchar_unlocked()	_getchar_unlocked()
+#define	putchar_unlocked(_c)	_putchar_unlocked(_c)
+#endif
 #endif /* __cplusplus */
 
 #if __MISC_VISIBLE
@@ -756,7 +782,7 @@ _ELIDABLE_INLINE int __sputc_r(struct _reent *_ptr, int _c, FILE *_p) {
 #define L_ctermid       16
 #endif
 
-#endif /* !__CUSTOM_FILE_IO__ */
+#else /* __CUSTOM_FILE_IO__ */
 
 #define	getchar()	getc(stdin)
 #define	putchar(x)	putc(x, stdout)
@@ -766,6 +792,8 @@ _ELIDABLE_INLINE int __sputc_r(struct _reent *_ptr, int _c, FILE *_p) {
 #define	putchar_unlocked(x)	putc_unlocked(x, stdout)
 #endif
 
+#endif /* !__CUSTOM_FILE_IO__ */
+
 _END_STD_C
 
 #endif /* _STDIO_H_ */
diff --git a/libc/xtensa-lx106-elf/include/string.h b/libc/xtensa-lx106-elf/include/string.h
index 7833aa1..9c536f3 100644
--- a/libc/xtensa-lx106-elf/include/string.h
+++ b/libc/xtensa-lx106-elf/include/string.h
@@ -121,6 +121,9 @@ size_t	 _EXFUN(strnlen,(const char *, size_t));
 #if __BSD_VISIBLE
 char 	*_EXFUN(strsep,(char **, const char *));
 #endif
+#if __BSD_VISIBLE
+char    *strnstr(const char *, const char *, size_t) __pure;
+#endif
 
 #if __MISC_VISIBLE
 char	*_EXFUN(strlwr,(char *));
diff --git a/libc/xtensa-lx106-elf/include/strings.h b/libc/xtensa-lx106-elf/include/strings.h
index 35fcdc0..122f2fc 100644
--- a/libc/xtensa-lx106-elf/include/strings.h
+++ b/libc/xtensa-lx106-elf/include/strings.h
@@ -50,12 +50,14 @@ void	 bzero(void *, size_t);					/* LEGACY */
 #if __BSD_VISIBLE
 void	 explicit_bzero(void *, size_t);
 #endif
-#if __XSI_VISIBLE
+#if __MISC_VISIBLE || __POSIX_VISIBLE < 200809 || __XSI_VISIBLE >= 700
 int	 ffs(int) __pure2;
 #endif
-#if __BSD_VISIBLE
+#if __GNU_VISIBLE
 int	 ffsl(long) __pure2;
 int	 ffsll(long long) __pure2;
+#endif
+#if __BSD_VISIBLE
 int	 fls(int) __pure2;
 int	 flsl(long) __pure2;
 int	 flsll(long long) __pure2;
diff --git a/libc/xtensa-lx106-elf/include/sys/_intsup.h b/libc/xtensa-lx106-elf/include/sys/_intsup.h
index fa78426..88d7400 100644
--- a/libc/xtensa-lx106-elf/include/sys/_intsup.h
+++ b/libc/xtensa-lx106-elf/include/sys/_intsup.h
@@ -4,8 +4,6 @@
  *
  * Permission to use, copy, modify, and distribute this software
  * is freely granted, provided that this notice is preserved.
- *
- * Modified for xtensa arch & non-long int32_t, removes automatic setting of __have_long32.
  */
 
 #ifndef _SYS__INTSUP_H
@@ -13,8 +11,185 @@
 
 #include <sys/features.h>
 
+#if __GNUC_PREREQ (3, 2)
+/* gcc > 3.2 implicitly defines the values we are interested */
 #define __STDINT_EXP(x) __##x##__
+#else
+#define __STDINT_EXP(x) x
+#include <limits.h>
+#endif
 
-#define __have_longlong64 1
+/* Determine how intptr_t and intN_t fastN_t and leastN_t are defined by gcc
+   for this target.  This is used to determine the correct printf() constant in
+   inttypes.h and other  constants in stdint.h.
+   So we end up with
+   ?(signed|unsigned) char == 0
+   ?(signed|unsigned) short == 1
+   ?(signed|unsigned) int == 2
+   ?(signed|unsigned) short int == 3
+   ?(signed|unsigned) long == 4
+   ?(signed|unsigned) long int == 6
+   ?(signed|unsigned) long long == 8
+   ?(signed|unsigned) long long int == 10
+ */
+#pragma push_macro("signed")
+#pragma push_macro("unsigned")
+#pragma push_macro("char")
+#pragma push_macro("short")
+#pragma push_macro("__int20")
+#pragma push_macro("int")
+#pragma push_macro("long")
+#undef signed
+#undef unsigned
+#undef char
+#undef short
+#undef int
+#undef __int20
+#undef long
+#define signed +0
+#define unsigned +0
+#define char +0
+#define short +1
+#define __int20 +2
+#define int +2
+#define long +4
+#if (__INTPTR_TYPE__ == 8 || __INTPTR_TYPE__ == 10)
+#define _INTPTR_EQ_LONGLONG
+#elif (__INTPTR_TYPE__ == 4 || __INTPTR_TYPE__ == 6)
+#define _INTPTR_EQ_LONG
+/* Note - the tests for _INTPTR_EQ_INT and _INTPTR_EQ_SHORT are currently
+   redundant as the values are not used.  But one day they may be needed
+   and so the tests remain.  */
+#elif __INTPTR_TYPE__ == 2
+#define _INTPTR_EQ_INT
+#elif (__INTPTR_TYPE__ == 1 || __INTPTR_TYPE__ == 3)
+#define _INTPTR_EQ_SHORT
+#else
+#error "Unable to determine type definition of intptr_t"
+#endif
+#if (__INT32_TYPE__ == 4 || __INT32_TYPE__ == 6)
+#define _INT32_EQ_LONG
+#elif __INT32_TYPE__ == 2
+/* Nothing to define because int32_t is safe to print as an int. */
+#else
+#error "Unable to determine type definition of int32_t"
+#endif
+
+#if (__INT8_TYPE__ == 0)
+#define __INT8 "hh"
+#elif (__INT8_TYPE__ == 1 || __INT8_TYPE__ == 3)
+#define __INT8 "h"
+#elif (__INT8_TYPE__ == 2)
+#define __INT8
+#elif (__INT8_TYPE__ == 4 || __INT8_TYPE__ == 6)
+#define __INT8 "l"
+#elif (__INT8_TYPE__ == 8 || __INT8_TYPE__ == 10)
+#define __INT8 "ll"
+#endif
+#if (__INT16_TYPE__ == 1 || __INT16_TYPE__ == 3)
+#define __INT16 "h"
+#elif (__INT16_TYPE__ == 2)
+#define __INT16
+#elif (__INT16_TYPE__ == 4 || __INT16_TYPE__ == 6)
+#define __INT16 "l"
+#elif (__INT16_TYPE__ == 8 || __INT16_TYPE__ == 10)
+#define __INT16 "ll"
+#endif
+#if (__INT32_TYPE__ == 2)
+#define __INT32
+#elif (__INT32_TYPE__ == 4 || __INT32_TYPE__ == 6)
+#define __INT32 "l"
+#elif (__INT32_TYPE__ == 8 || __INT32_TYPE__ == 10)
+#define __INT32 "ll"
+#endif
+#if (__INT64_TYPE__ == 2)
+#define __INT64
+#elif (__INT64_TYPE__ == 4 || __INT64_TYPE__ == 6)
+#define __INT64 "l"
+#elif (__INT64_TYPE__ == 8 || __INT64_TYPE__ == 10)
+#define __INT64 "ll"
+#endif
+#if (__INT_FAST8_TYPE__ == 0)
+#define __FAST8 "hh"
+#elif (__INT_FAST8_TYPE__ == 1 || __INT_FAST8_TYPE__ == 3)
+#define __FAST8 "h"
+#elif (__INT_FAST8_TYPE__ == 2)
+#define __FAST8
+#elif (__INT_FAST8_TYPE__ == 4 || __INT_FAST8_TYPE__ == 6)
+#define __FAST8 "l"
+#elif (__INT_FAST8_TYPE__ == 8 || __INT_FAST8_TYPE__ == 10)
+#define __FAST8 "ll"
+#endif
+#if (__INT_FAST16_TYPE__ == 1 || __INT_FAST16_TYPE__ == 3)
+#define __FAST16 "h"
+#elif (__INT_FAST16_TYPE__ == 2)
+#define __FAST16
+#elif (__INT_FAST16_TYPE__ == 4 || __INT_FAST16_TYPE__ == 6)
+#define __FAST16 "l"
+#elif (__INT_FAST16_TYPE__ == 8 || __INT_FAST16_TYPE__ == 10)
+#define __FAST16 "ll"
+#endif
+#if (__INT_FAST32_TYPE__ == 2)
+#define __FAST32
+#elif (__INT_FAST32_TYPE__ == 4 || __INT_FAST32_TYPE__ == 6)
+#define __FAST32 "l"
+#elif (__INT_FAST32_TYPE__ == 8 || __INT_FAST32_TYPE__ == 10)
+#define __FAST32 "ll"
+#endif
+#if (__INT_FAST64_TYPE__ == 2)
+#define __FAST64
+#elif (__INT_FAST64_TYPE__ == 4 || __INT_FAST64_TYPE__ == 6)
+#define __FAST64 "l"
+#elif (__INT_FAST64_TYPE__ == 8 || __INT_FAST64_TYPE__ == 10)
+#define __FAST64 "ll"
+#endif
+
+#if (__INT_LEAST8_TYPE__ == 0)
+#define __LEAST8 "hh"
+#elif (__INT_LEAST8_TYPE__ == 1 || __INT_LEAST8_TYPE__ == 3)
+#define __LEAST8 "h"
+#elif (__INT_LEAST8_TYPE__ == 2)
+#define __LEAST8
+#elif (__INT_LEAST8_TYPE__ == 4 || __INT_LEAST8_TYPE__ == 6)
+#define __LEAST8 "l"
+#elif (__INT_LEAST8_TYPE__ == 8 || __INT_LEAST8_TYPE__ == 10)
+#define __LEAST8 "ll"
+#endif
+#if (__INT_LEAST16_TYPE__ == 1 || __INT_LEAST16_TYPE__ == 3)
+#define __LEAST16 "h"
+#elif (__INT_LEAST16_TYPE__ == 2)
+#define __LEAST16
+#elif (__INT_LEAST16_TYPE__ == 4 || __INT_LEAST16_TYPE__ == 6)
+#define __LEAST16 "l"
+#elif (__INT_LEAST16_TYPE__ == 8 || __INT_LEAST16_TYPE__ == 10)
+#define __LEAST16 "ll"
+#endif
+#if (__INT_LEAST32_TYPE__ == 2)
+#define __LEAST32
+#elif (__INT_LEAST32_TYPE__ == 4 || __INT_LEAST32_TYPE__ == 6)
+#define __LEAST32 "l"
+#elif (__INT_LEAST32_TYPE__ == 8 || __INT_LEAST32_TYPE__ == 10)
+#define __LEAST32 "ll"
+#endif
+#if (__INT_LEAST64_TYPE__ == 2)
+#define __LEAST64
+#elif (__INT_LEAST64_TYPE__ == 4 || __INT_LEAST64_TYPE__ == 6)
+#define __LEAST64 "l"
+#elif (__INT_LEAST64_TYPE__ == 8 || __INT_LEAST64_TYPE__ == 10)
+#define __LEAST64 "ll"
+#endif
+#undef signed
+#undef unsigned
+#undef char
+#undef short
+#undef int
+#undef long
+#pragma pop_macro("signed")
+#pragma pop_macro("unsigned")
+#pragma pop_macro("char")
+#pragma pop_macro("short")
+#pragma pop_macro("__int20")
+#pragma pop_macro("int")
+#pragma pop_macro("long")
 
 #endif /* _SYS__INTSUP_H */
diff --git a/libc/xtensa-lx106-elf/include/sys/_types.h b/libc/xtensa-lx106-elf/include/sys/_types.h
index 98b93ce..72e1dc1 100644
--- a/libc/xtensa-lx106-elf/include/sys/_types.h
+++ b/libc/xtensa-lx106-elf/include/sys/_types.h
@@ -180,10 +180,17 @@ typedef _LOCK_RECURSIVE_T _flock_t;
 typedef void *_iconv_t;
 #endif
 
+#ifndef __machine_clock_t_defined
 #define	_CLOCK_T_	unsigned long	/* clock() */
+#endif
+
 typedef	_CLOCK_T_	__clock_t;
 
-#define	_TIME_T_	long		/* time() */
+#if defined(_USE_LONG_TIME_T) || __LONG_MAX__ > 0x7fffffffL
+#define	_TIME_T_ long
+#else
+#define	_TIME_T_ __int_least64_t
+#endif
 typedef	_TIME_T_	__time_t;
 
 #define	_CLOCKID_T_ 	unsigned long
diff --git a/libc/xtensa-lx106-elf/include/sys/cdefs.h b/libc/xtensa-lx106-elf/include/sys/cdefs.h
index 2e63a07..8ce14b6 100644
--- a/libc/xtensa-lx106-elf/include/sys/cdefs.h
+++ b/libc/xtensa-lx106-elf/include/sys/cdefs.h
@@ -681,6 +681,8 @@
 #endif
 
 /* Structure implements a lock. */
+/* FIXME: Use __lockable__, etc. to avoid colliding with user namespace macros,
+ * once clang is fixed: https://bugs.llvm.org/show_bug.cgi?id=34319 */
 #define	__lockable		__lock_annotate(lockable)
 
 /* Function acquires an exclusive or shared lock. */
diff --git a/libc/xtensa-lx106-elf/include/sys/config.h b/libc/xtensa-lx106-elf/include/sys/config.h
index 24ca1a0..3c185ea 100644
--- a/libc/xtensa-lx106-elf/include/sys/config.h
+++ b/libc/xtensa-lx106-elf/include/sys/config.h
@@ -75,7 +75,7 @@
 #define _POINTER_INT short
 #endif
 
-#if defined(__m68k__) || defined(__mc68000__)
+#if defined(__m68k__) || defined(__mc68000__) || defined(__riscv)
 #define _READ_WRITE_RETURN_TYPE _ssize_t
 #endif
 
@@ -154,6 +154,7 @@
 #define _REENT_SMALL
 #endif
 
+#define __BUFSIZ__ 256
 #define __SMALL_BITFIELDS
 
 #ifdef __MSP430X_LARGE__
@@ -289,6 +290,12 @@
 #endif
 #endif
 
+#ifdef _WANT_USE_LONG_TIME_T
+#ifndef _USE_LONG_TIME_T
+#define _USE_LONG_TIME_T
+#endif
+#endif
+
 /* If _MB_EXTENDED_CHARSETS_ALL is set, we want all of the extended
    charsets.  The extended charsets add a few functions and a couple
    of tables of a few K each. */
diff --git a/libc/xtensa-lx106-elf/include/sys/features.h b/libc/xtensa-lx106-elf/include/sys/features.h
index 1f9271b..c9133af 100644
--- a/libc/xtensa-lx106-elf/include/sys/features.h
+++ b/libc/xtensa-lx106-elf/include/sys/features.h
@@ -505,10 +505,9 @@ extern "C" {
 /* #define _XOPEN_UNIX				    -1 */
 #endif /* __XSI_VISIBLE */
 
-/* The value corresponds to UNICODE version 4.0, which is the version
-   supported by XP.  Newlib supports 5.2 (2011) but so far Cygwin needs
-   the MS conversions for double-byte charsets. */
-#define __STDC_ISO_10646__ 200305L
+/* The value corresponds to UNICODE version 5.2, which is the current
+   state of newlib's wide char conversion functions. */
+#define __STDC_ISO_10646__ 200910L
 
 #endif /* __CYGWIN__ */
 
diff --git a/libc/xtensa-lx106-elf/lib/libc.a b/libc/xtensa-lx106-elf/lib/libc.a
index 1df238a..2c1132e 100644
Binary files a/libc/xtensa-lx106-elf/lib/libc.a and b/libc/xtensa-lx106-elf/lib/libc.a differ
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