[patch #7074] shared_ptr & weak_ptr from boost

[Dustin J. Mitchell]

Follow-up Comment #5, patch #7074 (project autoconf-archive):

I will try to be clearer:

Instead of
                    [
                        ($2)
                    ],
please use
                    [
                        $2
                        :
                    ],

The parentheses are interpreted specially by the shell and may cause problems
for users.

The : provides a statement for the shell to execute in case $2 is the empty
string.

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