Debian Package rebuild

"Access to a protected member" build failure(s) — clang 11.0.0

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This is a difference of interpretation between gcc and clang.
See gcc bug#52136 and clang bug #6840.

class address 
{
protected:
    static int parseNext(int a);
};


class mailbox : public address
{
    friend class mailboxField;
};

class mailboxField
{
    void parse(int a)
        {
            address::parseNext(a);
            // will work with:
            // mailbox::parseNext(a);
        }
};

clang will fail with:

$  clang++    -c mailboxField.cpp   
mailboxField.cpp:18:22: error: 'parseNext' is a protected member of 'address'
            address::parseNext(a);
                     ^
mailboxField.cpp:5:16: note: declared protected here
    static int parseNext(int a);
               ^
1 error generated.

2 errors

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