+#include <time.h>
+
+// ----------------------------------------------------------------------------
+// constants
+// ----------------------------------------------------------------------------
+
+// define off_t
+#if !defined(__WXMAC__) || defined(__UNIX__)
+ #include <sys/types.h>
+#else
+ typedef long off_t;
+#endif
+
+#if defined(__VISUALC__) || ( defined(__MWERKS__) && defined( __INTEL__) )
+ typedef _off_t off_t;
+#elif defined(__BORLANDC__) && defined(__WIN16__)
+ typedef long off_t;
+#elif defined(__SC__)
+ typedef long off_t;
+#elif defined(__MWERKS__) && !defined(__INTEL__)
+ typedef long off_t;
+#endif
+
+#if defined(__VISAGECPP__) && __IBMCPP__ >= 400
+//
+// VisualAge C++ V4.0 cannot have any external linkage const decs
+// in headers included by more than one primary source
+//
+extern const off_t wxInvalidOffset;
+#else
+const off_t wxInvalidOffset = (off_t)-1;
+#endif
+
+enum wxSeekMode
+{
+ wxFromStart,
+ wxFromCurrent,
+ wxFromEnd
+};
+
+WXDLLEXPORT_DATA(extern const wxChar*) wxEmptyString;
+
+// ----------------------------------------------------------------------------
+// declare our versions of low level file functions: some compilers prepend
+// underscores to the usual names, some also have Unicode versions of them
+// ----------------------------------------------------------------------------
+
+// Microsoft compiler loves underscores, feed them to it
+#if defined( __VISUALC__ ) \
+ || ( defined(__MINGW32__) && wxCHECK_W32API_VERSION( 0, 5 ) ) \
+ || ( defined(__MWERKS__) && defined(__WXMSW__) )
+ // functions
+ #define wxClose _close
+ #define wxRead _read
+ #define wxWrite _write
+ #define wxLseek _lseek
+ #define wxFsync _commit
+ #define wxEof _eof
+
+ #define wxTell _tell
+
+ #if wxUSE_UNICODE
+ #if wxUSE_UNICODE_MSLU
+ #define wxOpen wxMSLU__wopen
+ #define wxAccess wxMSLU__waccess
+ #define wxMkDir wxMSLU__wmkdir
+ #define wxRmDir wxMSLU__wrmdir
+ #define wxStat wxMSLU__wstat
+ #else
+ #define wxOpen _wopen
+ #define wxAccess _waccess
+ #define wxMkDir _wmkdir
+ #define wxRmDir _wrmdir
+ #define wxStat _wstat
+ #endif
+ #else // !wxUSE_UNICODE
+ #define wxOpen _open
+ #define wxAccess _access
+ #define wxMkDir _mkdir
+ #define wxRmDir _rmdir
+ #define wxStat _stat
+ #endif
+
+ // types
+ #define wxStructStat struct _stat
+
+ // constants (unless already defined by the user code)
+ #ifndef O_RDONLY
+ #define O_RDONLY _O_RDONLY
+ #define O_WRONLY _O_WRONLY
+ #define O_RDWR _O_RDWR
+ #define O_EXCL _O_EXCL
+ #define O_CREAT _O_CREAT
+ #define O_BINARY _O_BINARY
+
+ #define S_IFMT _S_IFMT
+ #define S_IFDIR _S_IFDIR
+ #define S_IFREG _S_IFREG
+ #endif // O_RDONLY
+#else
+ // functions
+ #define wxClose close
+ #define wxRead read
+ #define wxWrite write
+ #define wxLseek lseek
+ #define wxFsync commit
+ #define wxEof eof
+
+ #define wxMkDir mkdir
+ #define wxRmDir rmdir
+
+ #define wxTell(fd) lseek(fd, 0, SEEK_CUR)
+
+ #define wxStructStat struct stat
+
+#if wxUSE_UNICODE
+# define wxNEED_WX_UNISTD_H
+WXDLLEXPORT int wxStat( const wxChar *file_name, wxStructStat *buf );
+WXDLLEXPORT int wxAccess( const wxChar *pathname, int mode );
+WXDLLEXPORT int wxOpen( const wxChar *pathname, int flags, mode_t mode );
+#else
+ #define wxOpen open
+ #define wxStat stat
+ #define wxAccess access
+#endif
+
+#endif // VC++
+
+// ----------------------------------------------------------------------------
+// functions
+// ----------------------------------------------------------------------------
+WXDLLEXPORT bool wxFileExists(const wxString& filename);