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diff --git a/include/wchar.h b/include/wchar.h
--- a/include/wchar.h
+++ b/include/wchar.h
@@ -97,6 +97,9 @@
#define WCHAR_MIN __WCHAR_MIN
#define WCHAR_MAX __WCHAR_MAX
+#if __ISO_C_VISIBLE >= 2023
+#define WCHAR_WIDTH __WCHAR_WIDTH
+#endif
#ifndef WEOF
#define WEOF ((wint_t)-1)
diff --git a/sys/arm/include/_stdint.h b/sys/arm/include/_stdint.h
--- a/sys/arm/include/_stdint.h
+++ b/sys/arm/include/_stdint.h
@@ -166,7 +166,6 @@
#define PTRDIFF_WIDTH INT32_WIDTH
#define SIG_ATOMIC_WIDTH INT32_WIDTH
#define SIZE_WIDTH INT32_WIDTH
-#define WCHAR_WIDTH INT32_WIDTH
#define WINT_WIDTH INT32_WIDTH
#endif /* __ISO_C_VISIBLE >= 2023 */
diff --git a/sys/arm64/include/_stdint.h b/sys/arm64/include/_stdint.h
--- a/sys/arm64/include/_stdint.h
+++ b/sys/arm64/include/_stdint.h
@@ -168,7 +168,6 @@
#define PTRDIFF_WIDTH INT64_WIDTH
#define SIG_ATOMIC_WIDTH INT64_WIDTH
#define SIZE_WIDTH INT64_WIDTH
-#define WCHAR_WIDTH INT32_WIDTH
#define WINT_WIDTH INT32_WIDTH
#endif /* __ISO_C_VISIBLE >= 2023 */
diff --git a/sys/powerpc/include/_stdint.h b/sys/powerpc/include/_stdint.h
--- a/sys/powerpc/include/_stdint.h
+++ b/sys/powerpc/include/_stdint.h
@@ -213,7 +213,6 @@
#define SIZE_WIDTH INT32_WIDTH
#endif
#define SIG_ATOMIC_WIDTH INT32_WIDTH
-#define WCHAR_WIDTH INT32_WIDTH
#define WINT_WIDTH INT32_WIDTH
#endif /* __ISO_C_VISIBLE >= 2023 */
diff --git a/sys/riscv/include/_stdint.h b/sys/riscv/include/_stdint.h
--- a/sys/riscv/include/_stdint.h
+++ b/sys/riscv/include/_stdint.h
@@ -164,7 +164,6 @@
#define PTRDIFF_WIDTH INT64_WIDTH
#define SIG_ATOMIC_WIDTH INT64_WIDTH
#define SIZE_WIDTH INT64_WIDTH
-#define WCHAR_WIDTH INT32_WIDTH
#define WINT_WIDTH INT32_WIDTH
#endif /* __ISO_C_VISIBLE >= 2023 */
diff --git a/sys/sys/_types.h b/sys/sys/_types.h
--- a/sys/sys/_types.h
+++ b/sys/sys/_types.h
@@ -129,6 +129,8 @@
*/
#include <machine/_types.h>
+#define __WCHAR_WIDTH 32 /* number of bits in a wchar_t */
+
/*
* Standard type definitions.
*/
diff --git a/sys/sys/stdint.h b/sys/sys/stdint.h
--- a/sys/sys/stdint.h
+++ b/sys/sys/stdint.h
@@ -68,6 +68,9 @@
/* Limits of wchar_t. */
#define WCHAR_MIN __WCHAR_MIN
#define WCHAR_MAX __WCHAR_MAX
+#if __ISO_C_VISIBLE >= 2023
+#define WCHAR_WIDTH __WCHAR_WIDTH
+#endif
#if __EXT1_VISIBLE
/* ISO/IEC 9899:2011 K.3.4.4 */
diff --git a/sys/x86/include/_stdint.h b/sys/x86/include/_stdint.h
--- a/sys/x86/include/_stdint.h
+++ b/sys/x86/include/_stdint.h
@@ -207,7 +207,6 @@
#define SIG_ATOMIC_WIDTH INT32_WIDTH
#define SIZE_WIDTH INT32_WIDTH
#endif
-#define WCHAR_WIDTH INT32_WIDTH
#define WINT_WIDTH INT32_WIDTH
#endif /* __ISO_C_VISIBLE >= 2023 */

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