Index: config.auto.h.in
===================================================================
--- config.auto.h.in	(revision 2521)
+++ config.auto.h.in	(revision 2522)
@@ -44,8 +44,6 @@
 /* Define to 1 if you have the <sys/wait.h> header file. */
 #define HAVE_SYS_WAIT_H 1
 
-/* Define to 1 if you have the <unistd.h> header file. */
-#define HAVE_UNISTD_H 1
 
 /* Define to 1 if you have the <windows.h> header file. */
 /* #undef HAVE_WINDOWS_H */
@@ -160,6 +158,9 @@
 /* C89 has atexit() */
 #define HAS_ATEXIT 1
 
+/* C89 has this */
+#define HAVE_UNISTD_H 1
+
 /* Define to 1 if you have the `canonicalize_file_name' function.
    It's a GNU extension, assume we don't have it and fall back to
    realpath() */