cc -pthread  -Wall -Wextra -Werror -Wno-error=deprecated -Wno-error=deprecated-declarations wchar/fwprintf.c -o wchar/fwprintf -D_POSIX_C_SOURCE=202405L -lm -lpthread -lrt -lintl -liconv
wchar/fwprintf.c:5:60: error: ‘fwprintf’ undeclared here (not in a function)
    5 | int (*foo)(FILE *restrict, const wchar_t *restrict, ...) = fwprintf;
      |                                                            ^~~~~~~~