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$is_magick = 0;

if ( is_installed Image::Magick ) { $is_magick = 1 }

if ( $is_magick = 0 ) {

...

  do stuff with Image::Magick ...
}

our $is_magick = 0;
eval 'require GD';
...
  # we have GD, go for it!
  $is_magick = 1;
}

our $is_magick = 1;
BEGIN {
...
    $is_magick = 0;
  }
}