cc -O2 -pipe -pthread  -Wall -Wextra -Werror=implicit-function-declaration spawn/posix_spawn_file_actions_addchdir.c -o spawn/posix_spawn_file_actions_addchdir -D_GNU_SOURCE -D_BSD_SOURCE -D_ALL_SOURCE -D_DEFAULT_SOURCE  -lm -lpthread -lrt  -lstdthreads -lcrypt
spawn/posix_spawn_file_actions_addchdir.c:40:16: error: call to undeclared function 'posix_spawn_file_actions_addchdir'; ISO C99 and later do not support implicit function declarations [-Werror,-Wimplicit-function-declaration]
   40 |         if ( (errno = posix_spawn_file_actions_addchdir(&actions, "spawn")) )
      |                       ^
spawn/posix_spawn_file_actions_addchdir.c:40:16: note: did you mean 'posix_spawn_file_actions_addchdir_np'?
/usr/include/spawn.h:90:5: note: 'posix_spawn_file_actions_addchdir_np' declared here
   90 | int posix_spawn_file_actions_addchdir_np(posix_spawn_file_actions_t *
      |     ^
1 error generated.