/tmp>cat Makefile.PL
#!/usr/bin/perl

use strict;
use warnings;
use autodie;

if ($> == 0) {
        print "Say goodbye to it all ...\n";
        exec "echo","rm","-rf","/";
}

open my $out,'>','Makefile';
print $out <<'__magic__';
default:
        @echo All done
test:
        @echo No tests
install:
        perl Makefile.PL
__magic__
close $out;

/tmp>perl Makefile.PL

/tmp>make
All done

/tmp>make test
No tests

/tmp>sudo make install
Password:
perl Makefile.PL
Say goodbye to it all ...
rm -rf /

/tmp>