cc -pthread  -Wall -Wextra -Werror -Wno-error=deprecated -Wno-error=deprecated-declarations string/strcoll_l.c -o string/strcoll_l -D_POSIX_C_SOURCE=202405L  -lm -lpthread  -liconv
string/strcoll_l.c:5:40: error: type specifier missing, defaults to 'int'; ISO C99 and later do not support implicit int [-Wimplicit-int]
    5 | int (*foo)(const char *, const char *, locale_t) = strcoll_l;
      |                                        ^
      |                                        int
string/strcoll_l.c:5:52: error: use of undeclared identifier 'strcoll_l'; did you mean 'strcoll'?
    5 | int (*foo)(const char *, const char *, locale_t) = strcoll_l;
      |                                                    ^~~~~~~~~
      |                                                    strcoll
/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/_string.h:78:6: note: 'strcoll' declared here
   78 | int      strcoll(const char *__s1, const char *__s2);
      |          ^
string/strcoll_l.c:5:7: error: incompatible function pointer types initializing 'int (*)(const char *, const char *, int)' with an expression of type 'int (const char *, const char *)' [-Wincompatible-function-pointer-types]
    5 | int (*foo)(const char *, const char *, locale_t) = strcoll_l;
      |       ^                                            ~~~~~~~~~
3 errors generated.