cc -O2 -pthread  -Wall -Wextra -Werror -Wno-error=deprecated -Wno-error=deprecated-declarations langinfo/nl_langinfo_l.c -o langinfo/nl_langinfo_l -D_POSIX_C_SOURCE=202405L  -lm -lpthread -lrt  -lintl -lcrypt
langinfo/nl_langinfo_l.c:5:23: error: unknown type name 'locale_t'
    5 | char *(*foo)(nl_item, locale_t) = nl_langinfo_l;
      |                       ^~~~~~~~