diff --git a/aclocal.m4 b/aclocal.m4
index f98db73..85f00dd 100644
--- a/aclocal.m4
+++ b/aclocal.m4
@@ -1,6 +1,6 @@
-# generated automatically by aclocal 1.15 -*- Autoconf -*-
+# generated automatically by aclocal 1.16.1 -*- Autoconf -*-
 
-# Copyright (C) 1996-2014 Free Software Foundation, Inc.
+# Copyright (C) 1996-2018 Free Software Foundation, Inc.
 
 # This file is free software; the Free Software Foundation
 # gives unlimited permission to copy and/or distribute it,
diff --git a/configure b/configure
index 867e2fc..d98d14a 100755
--- a/configure
+++ b/configure
@@ -15542,6 +15542,8 @@
   cat confdefs.h - <<_ACEOF >conftest.$ac_ext
 /* end confdefs.h.  */
 
+#include <stdlib.h>
+#include <unistd.h>
 int main()
 {
 	int val1 = nice(1);
diff --git a/pyconfig.h.in b/pyconfig.h.in
index 8db06d9..d41d579 100644
--- a/pyconfig.h.in
+++ b/pyconfig.h.in
@@ -144,18 +144,6 @@
 /* Define to 1 if you have the `copysign' function. */
 #undef HAVE_COPYSIGN
 
-/* Define to 1 if you must link with -lrt for shm_open(). */
-#undef SHM_NEEDS_LIBRT
-
-/* Define to 1 if you have the <sys/mman.h> header file. */
-#undef HAVE_SYS_MMAN_H
-
-/* Define to 1 if you have the shm_open syscall */
-#undef HAVE_SHM_OPEN
-
-/* Define to 1 if you have the shm_unlink syscall */
-#undef HAVE_SHM_UNLINK
-
 /* Define to 1 if you have the <crypt.h> header file. */
 #undef HAVE_CRYPT_H
 
@@ -930,6 +918,12 @@
 /* Define to 1 if you have the <shadow.h> header file. */
 #undef HAVE_SHADOW_H
 
+/* Define to 1 if you have the `shm_open' function. */
+#undef HAVE_SHM_OPEN
+
+/* Define to 1 if you have the `shm_unlink' function. */
+#undef HAVE_SHM_UNLINK
+
 /* Define to 1 if you have the `sigaction' function. */
 #undef HAVE_SIGACTION
 
@@ -1109,6 +1103,9 @@
 /* Define to 1 if you have the <sys/mkdev.h> header file. */
 #undef HAVE_SYS_MKDEV_H
 
+/* Define to 1 if you have the <sys/mman.h> header file. */
+#undef HAVE_SYS_MMAN_H
+
 /* Define to 1 if you have the <sys/modem.h> header file. */
 #undef HAVE_SYS_MODEM_H
 
@@ -1383,6 +1380,9 @@
 /* Define if setpgrp() must be called as setpgrp(0, 0). */
 #undef SETPGRP_HAVE_ARG
 
+/* Define to 1 if you must link with -lrt for shm_open(). */
+#undef SHM_NEEDS_LIBRT
+
 /* Define if i>>j for signed int i does not extend the sign bit when i < 0 */
 #undef SIGNED_RIGHT_SHIFT_ZERO_FILLS