> perl Makefile.PL
> dmake
......
......
In file included from ../pTk/mTk/xlib/X11/Xlib.h:31:0,
                 from ClientWin.c:30:
../pTk/mTk/xlib/X11/X.h:44:1: error: unknown type name '__int64'
dmake:  Error code 129, while making 'ClientWin.o'
dmake:  Error code 255, while making 'pTk\libpTk.a'