@@ -5150,7 +5150,7 @@ fi
 # checks for library functions
 AC_CHECK_FUNCS([ \
   accept4 alarm bind_textdomain_codeset chmod chown clock close_range confstr \
-  copy_file_range ctermid dup dup3 execv explicit_bzero explicit_memset \
+  copy_file_range ctermid dup explicit_bzero explicit_memset \
   faccessat fchmod fchmodat fchown fchownat fdopendir fdwalk fexecve \
   fork fork1 fpathconf fstatat ftime ftruncate futimens futimes futimesat \
   gai_strerror getegid geteuid getgid getgrgid getgrgid_r \
@@ -5160,7 +5160,7 @@ AC_CHECK_FUNCS([ \
   getspnam getuid getwd if_nameindex initgroups kill killpg lchown linkat \
   lockf lstat lutimes madvise mbrtowc memrchr mkdirat mkfifo mkfifoat \
   mknod mknodat mktime mmap mremap nice openat opendir pathconf pause pipe \
-  pipe2 plock poll posix_fadvise posix_fallocate posix_spawn posix_spawnp \
+  plock poll posix_fadvise posix_fallocate posix_spawn posix_spawnp \
   pread preadv preadv2 pthread_condattr_setclock pthread_init pthread_kill \
   pwrite pwritev pwritev2 readlink readlinkat readv realpath renameat \
   rtpSpawn sched_get_priority_max sched_rr_get_interval sched_setaffinity \
@@ -5187,7 +5187,7 @@ fi
 # header definition prevents usage - autoconf doesn't use the headers), or
 # raise an error if used at runtime. Force these symbols off.
 if test "$ac_sys_system" != "iOS" ; then
-  AC_CHECK_FUNCS([getentropy getgroups system])
+  AC_CHECK_FUNCS([dup3 getentropy getgroups pipe2 system])
 fi
 
 AC_CHECK_DECL([dirfd],