cc -pthread  -Wall -Wextra -Werror -Wno-error=deprecated -Wno-error=deprecated-declarations wchar/vfwscanf.c -o wchar/vfwscanf -D_POSIX_C_SOURCE=202405L -lm -lpthread -lrt -lintl -liconv
wchar/vfwscanf.c:5:64: error: ‘vfwscanf’ undeclared here (not in a function)
    5 | int (*foo)(FILE *restrict, const wchar_t *restrict, va_list) = vfwscanf;
      |                                                                ^~~~~~~~