cc -pthread  -Wall -Wextra -Werror -Wno-error=deprecated -Wno-error=deprecated-declarations string/strxfrm_l.c -o string/strxfrm_l -D_POSIX_C_SOURCE=202405L  -lm -lpthread  -liconv
string/strxfrm_l.c:5:61: error: type specifier missing, defaults to 'int'; ISO C99 and later do not support implicit int [-Wimplicit-int]
    5 | size_t (*foo)(char *restrict, const char *restrict, size_t, locale_t) = strxfrm_l;
      |                                                             ^
      |                                                             int
string/strxfrm_l.c:5:73: error: use of undeclared identifier 'strxfrm_l'; did you mean 'strxfrm'?
    5 | size_t (*foo)(char *restrict, const char *restrict, size_t, locale_t) = strxfrm_l;
      |                                                                         ^~~~~~~~~
      |                                                                         strxfrm
/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/_string.h:91:9: note: 'strxfrm' declared here
   91 | size_t   strxfrm(char *__s1, const char *__s2, size_t __n);
      |          ^
string/strxfrm_l.c:5:10: error: incompatible function pointer types initializing 'size_t (*)(char *restrict, const char *restrict, size_t, int)' (aka 'unsigned long (*)(char *restrict, const char *restrict, unsigned long, int)') with an expression of type 'unsigned long (char *, const char *, unsigned long)' [-Wincompatible-function-pointer-types]
    5 | size_t (*foo)(char *restrict, const char *restrict, size_t, locale_t) = strxfrm_l;
      |          ^                                                              ~~~~~~~~~
3 errors generated.