current qt4.py doesn't work for win32

[Christian Ehrlicher]

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Hi,

The current version of qt4.py throws this error:

- -----------------8<----------------
KeyError: 'PREFIX':
  File "SConstruct", line 105:
    env.subdirs(dirs)
  File "bksys\generic.py", line 880:
    lenv.SConscript(lenv.join(i, 'SConscript'))
  File "D:\Programme\Python\scons-0.96.91\SCons\Script\SConscript.py",
line 494:
    return apply(_SConscript, [self.fs,] + files, {'exports' : exports})
  File "D:\Programme\Python\scons-0.96.91\SCons\Script\SConscript.py",
line 226:
    exec _file_ in call_stack[-1].globals
  File "win\SConscript", line 7:
    obj = env.qt4obj('shlib',env)
  File "./bksys\qt4.py", line 345:
    if val == 'shlib':     self.instdir=senv.join(senv['PREFIX'], 'lib')
  File "D:\Programme\Python\scons-0.96.91\SCons\Environment.py", line 267:
    return self._dict[key]
- -----------------8<----------------


Christian
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