-acl_t acl_get_file_at (int dirfd, const char *file, acl_type_t type);
-int acl_set_file_at (int dirfd, const char *file, acl_type_t type, acl_t acl);
-int file_has_acl_at (int dirfd, char const *, struct stat const *);
+static acl_t acl_get_file_at (int, const char *, acl_type_t);
+static int acl_set_file_at (int, const char *, acl_type_t, acl_t);
+static int file_has_acl_at (int, char const *, struct stat const *);