'Convert a prefix header path to its output directory form.'

def Pchify(self, path, lang):

    path = self.Absolutify(path)
    if ('$(' in path):
        path = path.replace('$(obj)/', ('$(obj).%s/$(TARGET)/pch-%s' % (self.toolset, lang)))
        return path
    return ('$(obj).%s/$(TARGET)/pch-%s/%s' % (self.toolset, lang, path))
