gcc -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 -lrt -lxnet -lsocket -latomic
locale/getlocalename_l.c:5:25: error: unknown type name ‘locale_t’
    5 | const char *(*foo)(int, locale_t) = getlocalename_l;
      |                         ^~~~~~~~