Include <unistd.h> in Python.h. Fixes #500924.
diff --git a/Python/bltinmodule.c b/Python/bltinmodule.c
index f5ce749..c997ecf 100644
--- a/Python/bltinmodule.c
+++ b/Python/bltinmodule.c
@@ -9,10 +9,6 @@
#include <ctype.h>
-#ifdef HAVE_UNISTD_H
-#include <unistd.h>
-#endif
-
#ifdef RISCOS
#include "unixstuff.h"
#endif
diff --git a/Python/dynload_beos.c b/Python/dynload_beos.c
index 5de96c9..eec8592 100644
--- a/Python/dynload_beos.c
+++ b/Python/dynload_beos.c
@@ -4,7 +4,6 @@
#include <kernel/image.h>
#include <kernel/OS.h>
#include <stdlib.h>
-#include <unistd.h>
#include "Python.h"
#include "importdl.h"
diff --git a/Python/frozenmain.c b/Python/frozenmain.c
index efc87d7..21724ef 100644
--- a/Python/frozenmain.c
+++ b/Python/frozenmain.c
@@ -9,15 +9,6 @@
extern int PyInitFrozenExtensions(void);
#endif
-#ifdef HAVE_UNISTD_H
-#include <unistd.h> /* For isatty() */
-#endif
-
-/* For isatty()'s proto. - [cjh] */
-#ifdef HAVE_UNISTD_H
-#include <unistd.h>
-#endif
-
/* Main program */
int
diff --git a/Python/import.c b/Python/import.c
index 0b4cd0f..ba7d5d5 100644
--- a/Python/import.c
+++ b/Python/import.c
@@ -15,10 +15,6 @@
#include "macglue.h"
#endif
-#ifdef HAVE_UNISTD_H
-#include <unistd.h>
-#endif
-
#ifdef HAVE_FCNTL_H
#include <fcntl.h>
#endif
diff --git a/Python/pythonrun.c b/Python/pythonrun.c
index 4294c97..6b70739 100644
--- a/Python/pythonrun.c
+++ b/Python/pythonrun.c
@@ -13,10 +13,6 @@
#include "eval.h"
#include "marshal.h"
-#ifdef HAVE_UNISTD_H
-#include <unistd.h>
-#endif
-
#ifdef HAVE_SIGNAL_H
#include <signal.h>
#endif
diff --git a/Python/sysmodule.c b/Python/sysmodule.c
index ff49adc..cdc728c 100644
--- a/Python/sysmodule.c
+++ b/Python/sysmodule.c
@@ -20,10 +20,6 @@
#include "osdefs.h"
-#ifdef HAVE_UNISTD_H
-#include <unistd.h>
-#endif
-
#ifdef MS_COREDLL
extern void *PyWin_DLLhModule;
/* A string loaded from the DLL at startup: */
diff --git a/Python/thread.c b/Python/thread.c
index df42f31..f9a4de9 100644
--- a/Python/thread.c
+++ b/Python/thread.c
@@ -5,7 +5,7 @@
which is included by this file dependent on config settings.
Stuff shared by all thread_*.h files is collected here. */
-#include "pyconfig.h"
+#include "Python.h"
/* pyconfig.h may or may not define DL_IMPORT */
#ifndef DL_IMPORT /* declarations for DLL import/export */
@@ -24,10 +24,6 @@
#endif
#endif
-#ifdef HAVE_UNISTD_H
-#include <unistd.h>
-#endif
-
#ifdef __DGUX
#define _USING_POSIX4A_DRAFT6
#endif
diff --git a/Python/thread_solaris.h b/Python/thread_solaris.h
index 4c958b9..8e24126 100644
--- a/Python/thread_solaris.h
+++ b/Python/thread_solaris.h
@@ -1,7 +1,6 @@
#include <stdlib.h>
#include <stdio.h>
-#include <unistd.h>
#include <errno.h>
#include </usr/include/thread.h>
#undef _POSIX_THREADS