cc -pthread  -Wall -Wextra -Werror -Wno-error=deprecated -Wno-error=deprecated-declarations wchar/vswprintf.c -o wchar/vswprintf -D_POSIX_C_SOURCE=202405L -lm -lpthread -lrt -lcrypt -latomic
wchar/vswprintf.c:5:64: error: unknown type name ‘va_list’
    5 | int (*foo)(wchar_t *restrict, size_t, const wchar_t *restrict, va_list) = vswprintf;
      |                                                                ^~~~~~~
wchar/vswprintf.c:2:1: note: ‘va_list’ is defined in header ‘<stdarg.h>’; did you forget to ‘#include <stdarg.h>’?
    1 | #include <wchar.h>
  +++ |+#include <stdarg.h>
    2 | #ifdef vswprintf