clang -O2  -Wall -Wextra -Werror -Wno-error=deprecated -Wno-error=deprecated-declarations stdio/vscanf.c -o stdio/vscanf -D_POSIX_C_SOURCE=202405L  -lm  -lintl
stdio/vscanf.c:5:45: error: implicitly declaring library function 'vscanf' with type 'int (const char *restrict, __builtin_va_list)' [-Werror]
int (*foo)(const char *restrict, va_list) = vscanf;
                                            ^
stdio/vscanf.c:5:45: note: include the header <stdio.h> or explicitly provide a declaration for 'vscanf'
1 error generated.