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  1. or download this
    Device::BCM2835::gpio_fsel(...);
    
  2. or download this
    *gpio_fsel = \&Device::BCM2835::gpio_fsel;
    
  3. or download this
    for my $sub (qw{gpio_fsel gpio_set gpio_clr}) {
        no strict 'refs';
        *$sub = \&{"Device::BCM2835::$sub"};
    }
    
  4. or download this
    gpio_fsel(...);
    gpio_set(...);
    gpio_clr(...);