cc -O2 -pipe -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  -lstdthreads -lcrypt
locale/getlocalename_l.c:5:37: error: use of undeclared identifier 'getlocalename_l'
    5 | const char *(*foo)(int, locale_t) = getlocalename_l;
      |                                     ^
1 error generated.