cc -pipe -O   -pthread  -Wall -Wextra -Werror=implicit-function-declaration spawn/posix_spawn_file_actions_addfchdir.c -o spawn/posix_spawn_file_actions_addfchdir -D_GNU_SOURCE -D_BSD_SOURCE -D_ALL_SOURCE -D_DEFAULT_SOURCE  -lm -lpthread -lrt  -lrt -lcrypt
spawn/posix_spawn_file_actions_addfchdir.c: In function 'main':
spawn/posix_spawn_file_actions_addfchdir.c:44:16: error: implicit declaration of function 'posix_spawn_file_actions_addfchdir'; did you mean 'posix_spawn_file_actions_addclose'? [-Werror=implicit-function-declaration]
  if ( (errno = posix_spawn_file_actions_addfchdir(&actions, dirfd)) )
                ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
                posix_spawn_file_actions_addclose
cc1: some warnings being treated as errors