I came up with the following:

my @prereq = qw(DBI DBIx::AnyDBD);

  for my $prereq (@prereq) {

    eval "use $prereq" ;

    die "\nPlease install $prereq before installing DBSchema::Sample" 
+if ($@) ;
    my $v = "\$${prereq}::VERSION";  # LINE 115
    my $v2 = eval $v;
    print "Found $prereq version $v2\n" ; # LINE 117

  }
[download]

The problem is that Perl tries to interpolate the variable VERSION in package prereq in line 115 of your code. As long as there is no prereq package, $v will be empty; you'll get another warning on line 117, because your eval in line 116 also returns an empty string.
Hope this helped.
CombatSquirrel.

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Entropy is the tendency of everything going to hell.