Something like this works for me:
$is_magick = eval "require Image::Magick" ? 1 : 0;
(my $is_magick; is fine, too, btw)
Note that the assignment in our $is_magick = 1; in your snippet would be executed after the BEGIN block... Also, the BEGIN block is only necessary if you need
$is_magick's state to be valid early on.
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