Someone

static int qVersionInt()
{
        static int out = -1;

        if(out == -1) {
                QString str = QString::fromLatin1(qVersion());
                QStringList parts = str.split('.', QString::KeepEmptyParts);
                if(parts.count() != 3)
                {
                        out = 0;
                        return out;
                }

                out = 0;
                for(int n = 0; n < 3; ++n) {
                        bool ok;
                        int x = parts[n].toInt(&ok);
                        if(ok && x >= 0 && x <= 0xff)
                        {
                                out <<= 8;
                                out += x;
                        }
                        else
                        {
                                out = 0;
                                return out;
                        }
                }
        }

        return out;
}