cc -pthread   -Wall -Wextra -Werror -Wno-error=deprecated -Wno-error=deprecated-declarations wchar/vwprintf.c -o wchar/vwprintf -D_POSIX_C_SOURCE=202405L -lm -lpthread -lrt  -lintl -liconv
wchar/vwprintf.c:5:48: error: ‘vwprintf’ undeclared here (not in a function)
    5 | int (*foo)(const wchar_t *restrict, va_list) = vwprintf;
      |                                                ^~~~~~~~