cc -pthread  -Wall -Wextra -Werror -Wno-error=deprecated -Wno-error=deprecated-declarations wchar/wcscoll_l.c -o wchar/wcscoll_l -D_POSIX_C_SOURCE=202405L  -lm -lpthread  -liconv
wchar/wcscoll_l.c:5:46: error: type specifier missing, defaults to 'int' [-Werror,-Wimplicit-int]
int (*foo)(const wchar_t *, const wchar_t *, locale_t) = wcscoll_l;
                                             ^
wchar/wcscoll_l.c:5:58: error: use of undeclared identifier 'wcscoll_l'; did you mean 'wcscoll'?
int (*foo)(const wchar_t *, const wchar_t *, locale_t) = wcscoll_l;
                                                         ^~~~~~~~~
                                                         wcscoll
/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/wchar.h:127:5: note: 'wcscoll' declared here
int     wcscoll(const wchar_t *, const wchar_t *);
        ^
wchar/wcscoll_l.c:5:7: error: incompatible function pointer types initializing 'int (*)(const wchar_t *, const wchar_t *, int)' (aka 'int (*)(const int *, const int *, int)') with an expression of type 'int (const wchar_t *, const wchar_t *)' (aka 'int (const int *, const int *)') [-Werror,-Wincompatible-function-pointer-types]
int (*foo)(const wchar_t *, const wchar_t *, locale_t) = wcscoll_l;
      ^                                                  ~~~~~~~~~
3 errors generated.