	From Marc Baudoin.
	https://tug.org/pipermail/tlbuild/2024q4/005581.html

--- source/common/unicode/ptypes.h~	2024-10-24 11:24:00.000000000 -0700
+++ source/common/unicode/ptypes.h	2024-10-30 17:25:22.442817993 -0700
@@ -57,5 +57,5 @@
 // ICU4C must detect and deal with that.
 #if !defined(__cplusplus) && !defined(U_IN_DOXYGEN)
-#   if U_HAVE_CHAR16_T
+#   if U_HAVE_CHAR16_T && U_PLATFORM_IS_LINUX_BASED
 #       include <uchar.h>
 #   else
