The "proper" way is to use ExtUtils::MY 

sub MY::libscan {
    my( $mm, $file ) = @_;
    return if $file =~  /\.swp$/; # SKIP
    return $file;
}
WriteMakefile(
...

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In reply to Re: Making ExtUtils::MakeMaker ignore .swp files by Anonymous Monk
in thread Making ExtUtils::MakeMaker ignore .swp files by dragonchild

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