lib.c:144:8: error: use of undeclared identifier 'rl_readline_state'
  144 |    if (rl_readline_state & RL_STATE_INITIALIZED  &&  !(rl_readline_state & RL_STATE_DONE))
      |        ^
lib.c:144:28: error: use of undeclared identifier 'RL_STATE_INITIALIZED'
  144 |    if (rl_readline_state & RL_STATE_INITIALIZED  &&  !(rl_readline_state & RL_STATE_DONE))
      |                            ^
lib.c:149:8: error: use of undeclared identifier 'rl_readline_state'
  149 |    if (rl_readline_state & RL_STATE_INITIALIZED) {
      |        ^
lib.c:149:28: error: use of undeclared identifier 'RL_STATE_INITIALIZED'
  149 |    if (rl_readline_state & RL_STATE_INITIALIZED) {
      |                            ^
lib.c:150:7: error: call to undeclared function 'rl_save_prompt'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
  150 |       rl_save_prompt();
      |       ^
lib.c:150:7: note: did you mean 'rl_set_prompt'?
/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/readline/readline.h:204:7: note: 'rl_set_prompt' declared here
  204 | int              rl_set_prompt(const char *);
      |                  ^
lib.c:157:8: error: use of undeclared identifier 'rl_readline_state'
  157 |    if (rl_readline_state & RL_STATE_SIGHANDLER) {
      |        ^
lib.c:157:28: error: use of undeclared identifier 'RL_STATE_SIGHANDLER'
  157 |    if (rl_readline_state & RL_STATE_SIGHANDLER) {
      |                            ^
lib.c:158:7: error: call to undeclared function 'rl_reset_after_signal'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
  158 |       rl_reset_after_signal();
      |       ^
lib.c:158:7: note: did you mean 'rl_reset_terminal'?
/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/readline/readline.h:181:8: note: 'rl_reset_terminal' declared here
  181 | void             rl_reset_terminal(const char *);
      |                  ^
fatal error: too many errors emitted, stopping now [-ferror-limit=]
20 errors generated.