Index: Makefile.in
==================================================================
--- Makefile.in
+++ Makefile.in
@@ -237,12 +237,14 @@
   $(TOP)/src/mutex_w32.c \
   $(TOP)/src/notify.c \
   $(TOP)/src/os.c \
   $(TOP)/src/os.h \
   $(TOP)/src/os_common.h \
+  $(TOP)/src/os_setup.h \
   $(TOP)/src/os_unix.c \
   $(TOP)/src/os_win.c \
+  $(TOP)/src/os_win.h \
   $(TOP)/src/pager.c \
   $(TOP)/src/pager.h \
   $(TOP)/src/parse.y \
   $(TOP)/src/pcache.c \
   $(TOP)/src/pcache.h \
@@ -455,10 +457,12 @@
    keywordhash.h \
    $(TOP)/src/mutex.h \
    opcodes.h \
    $(TOP)/src/os.h \
    $(TOP)/src/os_common.h \
+   $(TOP)/src/os_setup.h \
+   $(TOP)/src/os_win.h \
    $(TOP)/src/pager.h \
    $(TOP)/src/pcache.h \
    parse.h  \
    sqlite3.h  \
    $(TOP)/src/sqlite3ext.h \

Index: Makefile.msc
==================================================================
--- Makefile.msc
+++ Makefile.msc
@@ -635,12 +635,14 @@
   $(TOP)\src\mutex_w32.c \
   $(TOP)\src\notify.c \
   $(TOP)\src\os.c \
   $(TOP)\src\os.h \
   $(TOP)\src\os_common.h \
+  $(TOP)\src\os_setup.h \
   $(TOP)\src\os_unix.c \
   $(TOP)\src\os_win.c \
+  $(TOP)\src\os_win.h \
   $(TOP)\src\pager.c \
   $(TOP)\src\pager.h \
   $(TOP)\src\parse.y \
   $(TOP)\src\pcache.c \
   $(TOP)\src\pcache.h \
@@ -856,10 +858,12 @@
    keywordhash.h \
    $(TOP)\src\mutex.h \
    opcodes.h \
    $(TOP)\src\os.h \
    $(TOP)\src\os_common.h \
+   $(TOP)\src\os_setup.h \
+   $(TOP)\src\os_win.h \
    $(TOP)\src\pager.h \
    $(TOP)\src\pcache.h \
    parse.h \
    sqlite3.h \
    $(TOP)\src\sqlite3ext.h \

Index: Makefile.vxworks
==================================================================
--- Makefile.vxworks
+++ Makefile.vxworks
@@ -260,12 +260,14 @@
   $(TOP)/src/mutex_w32.c \
   $(TOP)/src/notify.c \
   $(TOP)/src/os.c \
   $(TOP)/src/os.h \
   $(TOP)/src/os_common.h \
+  $(TOP)/src/os_setup.h \
   $(TOP)/src/os_unix.c \
   $(TOP)/src/os_win.c \
+  $(TOP)/src/os_win.h \
   $(TOP)/src/pager.c \
   $(TOP)/src/pager.h \
   $(TOP)/src/parse.y \
   $(TOP)/src/pcache.c \
   $(TOP)/src/pcache.h \
@@ -414,10 +416,12 @@
    keywordhash.h \
    $(TOP)/src/mutex.h \
    opcodes.h \
    $(TOP)/src/os.h \
    $(TOP)/src/os_common.h \
+   $(TOP)/src/os_setup.h \
+   $(TOP)/src/os_win.h \
    $(TOP)/src/pager.h \
    $(TOP)/src/pcache.h \
    parse.h  \
    sqlite3.h  \
    $(TOP)/src/sqlite3ext.h \

Index: main.mk
==================================================================
--- main.mk
+++ main.mk
@@ -119,12 +119,14 @@
   $(TOP)/src/mutex_w32.c \
   $(TOP)/src/notify.c \
   $(TOP)/src/os.c \
   $(TOP)/src/os.h \
   $(TOP)/src/os_common.h \
+  $(TOP)/src/os_setup.h \
   $(TOP)/src/os_unix.c \
   $(TOP)/src/os_win.c \
+  $(TOP)/src/os_win.h \
   $(TOP)/src/pager.c \
   $(TOP)/src/pager.h \
   $(TOP)/src/parse.y \
   $(TOP)/src/pcache.c \
   $(TOP)/src/pcache.h \
@@ -337,10 +339,12 @@
    keywordhash.h \
    $(TOP)/src/mutex.h \
    opcodes.h \
    $(TOP)/src/os.h \
    $(TOP)/src/os_common.h \
+   $(TOP)/src/os_setup.h \
+   $(TOP)/src/os_win.h \
    $(TOP)/src/pager.h \
    $(TOP)/src/pcache.h \
    parse.h  \
    sqlite3.h  \
    $(TOP)/src/sqlite3ext.h \

Index: src/mutex_w32.c
==================================================================
--- src/mutex_w32.c
+++ src/mutex_w32.c
@@ -17,10 +17,15 @@
 ** The code in this file is only used if we are compiling multithreaded
 ** on a win32 system.
 */
 #ifdef SQLITE_MUTEX_W32
 
+/*
+** Include the header file for the Windows VFS.
+*/
+#include "os_win.h"
+
 /*
 ** Each recursive mutex is an instance of the following structure.
 */
 struct sqlite3_mutex {
   CRITICAL_SECTION mutex;    /* Mutex controlling the lock */

Index: src/os.h
==================================================================
--- src/os.h
+++ src/os.h
@@ -19,87 +19,14 @@
 */
 #ifndef _SQLITE_OS_H_
 #define _SQLITE_OS_H_
 
 /*
-** Figure out if we are dealing with Unix, Windows, or some other
-** operating system.  After the following block of preprocess macros,
-** all of SQLITE_OS_UNIX, SQLITE_OS_WIN, and SQLITE_OS_OTHER 
-** will defined to either 1 or 0.  One of the four will be 1.  The other 
-** three will be 0.
-*/
-#if defined(SQLITE_OS_OTHER)
-# if SQLITE_OS_OTHER==1
-#   undef SQLITE_OS_UNIX
-#   define SQLITE_OS_UNIX 0
-#   undef SQLITE_OS_WIN
-#   define SQLITE_OS_WIN 0
-# else
-#   undef SQLITE_OS_OTHER
-# endif
-#endif
-#if !defined(SQLITE_OS_UNIX) && !defined(SQLITE_OS_OTHER)
-# define SQLITE_OS_OTHER 0
-# ifndef SQLITE_OS_WIN
-#   if defined(_WIN32) || defined(WIN32) || defined(__CYGWIN__) || defined(__MINGW32__) || defined(__BORLANDC__)
-#     define SQLITE_OS_WIN 1
-#     define SQLITE_OS_UNIX 0
-#   else
-#     define SQLITE_OS_WIN 0
-#     define SQLITE_OS_UNIX 1
-#  endif
-# else
-#  define SQLITE_OS_UNIX 0
-# endif
-#else
-# ifndef SQLITE_OS_WIN
-#  define SQLITE_OS_WIN 0
-# endif
-#endif
-
-#if SQLITE_OS_WIN
-# include <windows.h>
-#endif
-
-/*
-** Determine if we are dealing with Windows NT.
-**
-** We ought to be able to determine if we are compiling for win98 or winNT
-** using the _WIN32_WINNT macro as follows:
-**
-** #if defined(_WIN32_WINNT)
-** # define SQLITE_OS_WINNT 1
-** #else
-** # define SQLITE_OS_WINNT 0
-** #endif
-**
-** However, vs2005 does not set _WIN32_WINNT by default, as it ought to,
-** so the above test does not work.  We'll just assume that everything is
-** winNT unless the programmer explicitly says otherwise by setting
-** SQLITE_OS_WINNT to 0.
-*/
-#if SQLITE_OS_WIN && !defined(SQLITE_OS_WINNT)
-# define SQLITE_OS_WINNT 1
-#endif
-
-/*
-** Determine if we are dealing with WindowsCE - which has a much
-** reduced API.
-*/
-#if defined(_WIN32_WCE)
-# define SQLITE_OS_WINCE 1
-#else
-# define SQLITE_OS_WINCE 0
-#endif
-
-/*
-** Determine if we are dealing with WinRT, which provides only a subset of
-** the full Win32 API.
-*/
-#if !defined(SQLITE_OS_WINRT)
-# define SQLITE_OS_WINRT 0
-#endif
+** Attempt to automatically detect the operating system and setup the
+** necessary pre-processor macros for it.
+*/
+#include "os_setup.h"
 
 /* If the SET_FULLSYNC macro is not defined above, then make it
 ** a no-op
 */
 #ifndef SET_FULLSYNC

ADDED   src/os_setup.h
Index: src/os_setup.h
==================================================================
--- /dev/null
+++ src/os_setup.h
@@ -0,0 +1,57 @@
+/*
+** 2013 November 25
+**
+** The author disclaims copyright to this source code.  In place of
+** a legal notice, here is a blessing:
+**
+**    May you do good and not evil.
+**    May you find forgiveness for yourself and forgive others.
+**    May you share freely, never taking more than you give.
+**
+******************************************************************************
+**
+** This file contains pre-processor directives related to operating system
+** detection and/or setup.
+*/
+#ifndef _OS_SETUP_H_
+#define _OS_SETUP_H_
+
+/*
+** Figure out if we are dealing with Unix, Windows, or some other operating
+** system.
+**
+** After the following block of preprocess macros, all of SQLITE_OS_UNIX,
+** SQLITE_OS_WIN, and SQLITE_OS_OTHER will defined to either 1 or 0.  One of
+** the three will be 1.  The other two will be 0.
+*/
+#if defined(SQLITE_OS_OTHER)
+#  if SQLITE_OS_OTHER==1
+#    undef SQLITE_OS_UNIX
+#    define SQLITE_OS_UNIX 0
+#    undef SQLITE_OS_WIN
+#    define SQLITE_OS_WIN 0
+#  else
+#    undef SQLITE_OS_OTHER
+#  endif
+#endif
+#if !defined(SQLITE_OS_UNIX) && !defined(SQLITE_OS_OTHER)
+#  define SQLITE_OS_OTHER 0
+#  ifndef SQLITE_OS_WIN
+#    if defined(_WIN32) || defined(WIN32) || defined(__CYGWIN__) || \
+        defined(__MINGW32__) || defined(__BORLANDC__)
+#      define SQLITE_OS_WIN 1
+#      define SQLITE_OS_UNIX 0
+#    else
+#      define SQLITE_OS_WIN 0
+#      define SQLITE_OS_UNIX 1
+#    endif
+#  else
+#    define SQLITE_OS_UNIX 0
+#  endif
+#else
+#  ifndef SQLITE_OS_WIN
+#    define SQLITE_OS_WIN 0
+#  endif
+#endif
+
+#endif /* _OS_SETUP_H_ */

Index: src/os_win.c
==================================================================
--- src/os_win.c
+++ src/os_win.c
@@ -13,20 +13,20 @@
 ** This file contains code that is specific to Windows.
 */
 #include "sqliteInt.h"
 #if SQLITE_OS_WIN               /* This file is used for Windows only */
 
-#ifdef __CYGWIN__
-# include <sys/cygwin.h>
-# include <errno.h> /* amalgamator: keep */
-#endif
-
 /*
 ** Include code that is common to all os_*.c files
 */
 #include "os_common.h"
 
+/*
+** Include the header file for the Windows VFS.
+*/
+#include "os_win.h"
+
 /*
 ** Compiling and using WAL mode requires several APIs that are only
 ** available in Windows platforms based on the NT kernel.
 */
 #if !SQLITE_OS_WINNT && !defined(SQLITE_OMIT_WAL)

ADDED   src/os_win.h
Index: src/os_win.h
==================================================================
--- /dev/null
+++ src/os_win.h
@@ -0,0 +1,67 @@
+/*
+** 2013 November 25
+**
+** The author disclaims copyright to this source code.  In place of
+** a legal notice, here is a blessing:
+**
+**    May you do good and not evil.
+**    May you find forgiveness for yourself and forgive others.
+**    May you share freely, never taking more than you give.
+**
+******************************************************************************
+**
+** This file contains code that is specific to Windows.
+*/
+#ifndef _OS_WIN_H_
+#define _OS_WIN_H_
+
+/*
+** Include the primary Windows SDK header file.
+*/
+#include "windows.h"
+
+#ifdef __CYGWIN__
+# include <sys/cygwin.h>
+# include <errno.h> /* amalgamator: dontcache */
+#endif
+
+/*
+** Determine if we are dealing with Windows NT.
+**
+** We ought to be able to determine if we are compiling for Windows 9x or
+** Windows NT using the _WIN32_WINNT macro as follows:
+**
+** #if defined(_WIN32_WINNT)
+** # define SQLITE_OS_WINNT 1
+** #else
+** # define SQLITE_OS_WINNT 0
+** #endif
+**
+** However, Visual Studio 2005 does not set _WIN32_WINNT by default, as
+** it ought to, so the above test does not work.  We'll just assume that
+** everything is Windows NT unless the programmer explicitly says otherwise
+** by setting SQLITE_OS_WINNT to 0.
+*/
+#if SQLITE_OS_WIN && !defined(SQLITE_OS_WINNT)
+# define SQLITE_OS_WINNT 1
+#endif
+
+/*
+** Determine if we are dealing with Windows CE - which has a much reduced
+** API.
+*/
+#if defined(_WIN32_WCE)
+# define SQLITE_OS_WINCE 1
+#else
+# define SQLITE_OS_WINCE 0
+#endif
+
+/*
+** Determine if we are dealing with WinRT, which provides only a subset of
+** the full Win32 API.
+*/
+#if !defined(SQLITE_OS_WINRT)
+# define SQLITE_OS_WINRT 0
+#endif
+
+#endif /* _OS_WIN_H_ */

Index: src/test1.c
==================================================================
--- src/test1.c
+++ src/test1.c
@@ -12,10 +12,14 @@
 ** Code for testing all sorts of SQLite interfaces.  This code
 ** is not included in the SQLite library.  It is used for automated
 ** testing of the SQLite library.
 */
 #include "sqliteInt.h"
+#if SQLITE_OS_WIN
+#  include "os_win.h"
+#endif
+
 #include "vdbeInt.h"
 #include "tcl.h"
 #include <stdlib.h>
 #include <string.h>
 

Index: src/test_config.c
==================================================================
--- src/test_config.c
+++ src/test_config.c
@@ -18,10 +18,14 @@
 */
 
 #include "sqliteLimit.h"
 
 #include "sqliteInt.h"
+#if SQLITE_OS_WIN
+#  include "os_win.h"
+#endif
+
 #include "tcl.h"
 #include <stdlib.h>
 #include <string.h>
 
 /*

Index: src/test_osinst.c
==================================================================
--- src/test_osinst.c
+++ src/test_osinst.c
@@ -68,10 +68,16 @@
 **         offset   INTEGER           // File offset read or written
 **       );
 */
 
 #include "sqlite3.h"
+
+#include "os_setup.h"
+#if SQLITE_OS_WIN
+#  include "os_win.h"
+#endif
+
 #include <string.h>
 #include <assert.h>
 
 
 /*
@@ -219,11 +225,10 @@
   struct timeval sTime;
   gettimeofday(&sTime, 0);
   return sTime.tv_usec + (sqlite3_uint64)sTime.tv_sec * 1000000;
 }
 #elif SQLITE_OS_WIN
-#include <windows.h>
 #include <time.h>
 static sqlite3_uint64 vfslog_time(){
   FILETIME ft;
   sqlite3_uint64 u64time = 0;
  

Index: src/test_quota.c
==================================================================
--- src/test_quota.c
+++ src/test_quota.c
@@ -42,53 +42,17 @@
 #define sqlite3_mutex_leave(X)
 #define sqlite3_mutex_held(X)     ((void)(X),1)
 #define sqlite3_mutex_notheld(X)  ((void)(X),1)
 #endif /* SQLITE_THREADSAFE==0 */
 
-
-/*
-** Figure out if we are dealing with Unix, Windows, or some other
-** operating system.  After the following block of preprocess macros,
-** all of SQLITE_OS_UNIX, SQLITE_OS_WIN, and SQLITE_OS_OTHER 
-** will defined to either 1 or 0.  One of the four will be 1.  The other 
-** three will be 0.
-*/
-#if defined(SQLITE_OS_OTHER)
-# if SQLITE_OS_OTHER==1
-#   undef SQLITE_OS_UNIX
-#   define SQLITE_OS_UNIX 0
-#   undef SQLITE_OS_WIN
-#   define SQLITE_OS_WIN 0
-# else
-#   undef SQLITE_OS_OTHER
-# endif
-#endif
-#if !defined(SQLITE_OS_UNIX) && !defined(SQLITE_OS_OTHER)
-# define SQLITE_OS_OTHER 0
-# ifndef SQLITE_OS_WIN
-#   if defined(_WIN32) || defined(WIN32) || defined(__CYGWIN__) \
-                       || defined(__MINGW32__) || defined(__BORLANDC__)
-#     define SQLITE_OS_WIN 1
-#     define SQLITE_OS_UNIX 0
-#   else
-#     define SQLITE_OS_WIN 0
-#     define SQLITE_OS_UNIX 1
-#  endif
-# else
-#  define SQLITE_OS_UNIX 0
-# endif
-#else
-# ifndef SQLITE_OS_WIN
-#  define SQLITE_OS_WIN 0
-# endif
-#endif
+#include "os_setup.h"
 
 #if SQLITE_OS_UNIX
 # include <unistd.h>
 #endif
 #if SQLITE_OS_WIN
-# include <windows.h>
+# include "os_win.h"
 # include <io.h>
 #endif
 
 
 /************************ Object Definitions ******************************/

Index: src/test_quota.h
==================================================================
--- src/test_quota.h
+++ src/test_quota.h
@@ -29,16 +29,10 @@
 #ifndef _QUOTA_H_
 #include "sqlite3.h"
 #include <stdio.h>
 #include <sys/types.h>
 #include <sys/stat.h>
-#if SQLITE_OS_UNIX
-# include <unistd.h>
-#endif
-#if SQLITE_OS_WIN
-# include <windows.h>
-#endif
 
 /* Make this callable from C++ */
 #ifdef __cplusplus
 extern "C" {
 #endif

Index: tool/mksqlite3c-noext.tcl
==================================================================
--- tool/mksqlite3c-noext.tcl
+++ tool/mksqlite3c-noext.tcl
@@ -97,10 +97,12 @@
    hwtime.h
    keywordhash.h
    mutex.h
    opcodes.h
    os_common.h
+   os_setup.h
+   os_win.h
    os.h
    pager.h
    parse.h
    pcache.h
    sqlite3ext.h

Index: tool/mksqlite3c.tcl
==================================================================
--- tool/mksqlite3c.tcl
+++ tool/mksqlite3c.tcl
@@ -101,10 +101,12 @@
    hwtime.h
    keywordhash.h
    mutex.h
    opcodes.h
    os_common.h
+   os_setup.h
+   os_win.h
    os.h
    pager.h
    parse.h
    pcache.h
    rtree.h
@@ -166,11 +168,13 @@
           copy_file tsrc/$hdr
           section_comment "Continuing where we left off in $tail"
           if {$linemacros} {puts $out "#line [expr {$ln+1}] \"$filename\""}
         }
       } elseif {![info exists seen_hdr($hdr)]} {
-        set seen_hdr($hdr) 1
+        if {![regexp {/\*\s+amalgamator:\s+dontcache\s+\*/} $line]} {
+          set seen_hdr($hdr) 1
+        }
         puts $out $line
       } elseif {[regexp {/\*\s+amalgamator:\s+keep\s+\*/} $line]} {
         # This include file must be kept because there was a "keep"
         # directive inside of a line comment.
         puts $out $line

Index: tool/mksqlite3internalh.tcl
==================================================================
--- tool/mksqlite3internalh.tcl
+++ tool/mksqlite3internalh.tcl
@@ -58,10 +58,12 @@
    hash.h
    hwtime.h
    keywordhash.h
    opcodes.h
    os_common.h
+   os_setup.h
+   os_win.h
    os.h
    pager.h
    parse.h
    sqlite3ext.h
    sqlite3.h