cc -pthread  -Wall -Wextra -Werror -Wno-error=deprecated -Wno-error=deprecated-declarations wctype/wctype_l.c -o wctype/wctype_l -D_POSIX_C_SOURCE=202405L  -lm -lpthread  -liconv
wctype/wctype_l.c:5:31: error: type specifier missing, defaults to 'int' [-Werror,-Wimplicit-int]
wctype_t (*foo)(const char *, locale_t) = wctype_l;
                              ^
wctype/wctype_l.c:5:43: error: use of undeclared identifier 'wctype_l'; did you mean 'wctype'?
wctype_t (*foo)(const char *, locale_t) = wctype_l;
                                          ^~~~~~~~
                                          wctype
/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/_wctype.h:157:2: note: 'wctype' declared here
        wctype(const char *);
        ^
wctype/wctype_l.c:5:12: error: incompatible function pointer types initializing 'wctype_t (*)(const char *, int)' (aka 'unsigned int (*)(const char *, int)') with an expression of type 'wctype_t (const char *)' (aka 'unsigned int (const char *)') [-Werror,-Wincompatible-function-pointer-types]
wctype_t (*foo)(const char *, locale_t) = wctype_l;
           ^                              ~~~~~~~~
3 errors generated.