-dup2
-environ
-error
-exit
-fatal-signal
-gettext-h
-open
-spawn
-posix_spawnp
-posix_spawn_file_actions_init
-posix_spawn_file_actions_addclose
-posix_spawn_file_actions_adddup2
-posix_spawn_file_actions_addopen
-posix_spawn_file_actions_destroy
-posix_spawnattr_init
-posix_spawnattr_setsigmask
-posix_spawnattr_setflags
-posix_spawnattr_destroy
-stdbool
-strpbrk
-unistd
-unistd-safer
-wait-process