This is my latest attempt at a Makefile.PL section that invokes Apache::Bootstrap or exits with exit code 255. The intent is that if Apache::Bootstrap is not installed, the Makefile.PL dies with code 255, the same error number returned to the shell as if 'use 5.8.8;' failed in Makefile.PL.

I'm mainly looking for feedback on this code. The reasons that I need to do what I'm doing may not be all that clear, but I need to use either ExtUtils::MakeMaker or ModPerl::Build::MM, and that depends on the versions of mod_perl (if any) that are installed.

#!/usr/bin/perl

use strict;
use warnings;

###################################
# minimum version of A::B required
my $ab = 0.06;

eval { require Apache::Bootstrap };

($@ or ($Apache::Bootstrap::VERSION < $ab)) &&
    do { $! = 255; die("Apache::Bootstrap $ab required"); };


# make sure we have at least one minimum version of mod_perl

my $bs = eval { Apache::Bootstrap->new({
                          mod_perl2 => 1.99022,
                          mod_perl  => 1.30 }) };

do { $! = 255; die($@); } if $@;

#################################################
# use $bs to determine whether ExtUtils::MakeMaker
# or ModPerl::Build::MM should be used to write
# the Makefile
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