Index: src/os.h
==================================================================
--- src/os.h
+++ src/os.h
@@ -86,11 +86,13 @@
 #  define OS_MAC 0
 #  define OS_UNIX 0
 # endif
 #else
 # define OS_MAC 0
-# define OS_WIN 0
+# ifndef OS_WIN
+#  define OS_WIN 0
+# endif
 #endif
 
 /*
 ** A handle for an open file is stored in an OsFile object.
 */
@@ -113,10 +115,13 @@
 #  define SQLITE_MIN_SLEEP_MS 1000
 # endif
 #endif
 
 #if OS_WIN
+# if defined(__CYGWIN__)
+#  define __CYGWIN_USE_BIG_TYPES__
+# endif
 #include <windows.h>
 #include <winbase.h>
   typedef struct OsFile OsFile;
   struct OsFile {
     HANDLE h;               /* Handle for accessing the file */
@@ -123,11 +128,13 @@
     int locked;             /* 0: unlocked, <0: write lock, >0: read lock */
   };
 # if defined(_MSC_VER) || defined(__BORLANDC__)
     typedef __int64 off_t;
 # else
-    typedef long long off_t;
+#  if !defined(_CYGWIN_TYPES_H)
+     typedef long long off_t;
+#  endif
 # endif
 # define SQLITE_TEMPNAME_SIZE (MAX_PATH+50)
 # define SQLITE_MIN_SLEEP_MS 1
 #endif