def MergeFlags(self, args, unique=1, dict=None):
        if dict is None:
            dict = self
        if not SCons.Util.is_Dict(args):
            args = self.ParseFlags(args)
        if not unique:
            self.Append(**args)
            return self
        for key, value in args.items():
            if not value:
                continue
            try:
                orig = self[key]
            except KeyError:
                orig = value
            else:
                if not orig:
                    orig = value
                elif value:
                    try:
                        orig = orig + value
                    except (KeyError, TypeError):
                        try:
                            add_to_orig = orig.append
                        except AttributeError:
                            value.insert(0, orig)
                            orig = value
                        else:
                            add_to_orig(value)
            t = []
            if key[-4:] == 'PATH':
                for v in orig:
                    if v not in t:
                        t.append(v)
            else:
                orig.reverse()
                for v in orig:
                    if v not in t:
                        t.insert(0, v)
            self[key] = t
        return self