cc -pthread  -Wall -Wextra -Werror -Wno-error=deprecated -Wno-error=deprecated-declarations locale/getlocalename_l.c -o locale/getlocalename_l -D_POSIX_C_SOURCE=202405L  -lm -lpthread  -liconv
locale/getlocalename_l.c:5:25: error: type specifier missing, defaults to 'int' [-Werror,-Wimplicit-int]
const char *(*foo)(int, locale_t) = getlocalename_l;
                        ^
locale/getlocalename_l.c:5:37: error: use of undeclared identifier 'getlocalename_l'
const char *(*foo)(int, locale_t) = getlocalename_l;
                                    ^
2 errors generated.