cc -pthread   -Wall -Wextra -Werror -Wno-error=deprecated -Wno-error=deprecated-declarations ctype/locale_t.c -o ctype/locale_t -D_POSIX_C_SOURCE=202405L  -lm -lpthread   -liconv
ctype/locale_t.c:2:1: error: unknown type name 'locale_t'
    2 | locale_t* foo;
      | ^
1 error generated.