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        }
        $selected = 1;
    }
    elsif ($wanted == 2) {
        #warn "Looking for mod_perl 2.0";
        require_mod_perl();
        if ($mod_perl::VERSION < 2.0) {
            die "You don't seem to have mod_perl 2.0 installed";
        }
        $selected = 2;
    }
    else {
        require_mod_perl();
        $selected = $mod_perl::VERSION >= 1.99 ? 2 : 1;
        warn "Using $mod_perl::VERSION\n";
    }

    return $selected;
}

sub require_mod_perl {
    eval { require mod_perl };
    eval { require mod_perl2 }  if ($@);
    die "Can't find mod_perl installed\nThe error was: $@" if $@;
}

# the function looks at %ENV and Makefile.PL option to figure out
# whether a specific mod_perl generation was requested.
# It uses the following logic:
# via options:
# perl Makefile.PL MOD_PERL=2
# or via %ENV:
# env MOD_PERL=1 perl Makefile.PL
#
# return value is:
# 1 or 2 if the specification was found (mp 1 and mp 2 respectively)
# 0 otherwise
sub wanted_mp_generation {

    # check if we have a command line specification
    # flag: 0: unknown, 1: mp1, 2: mp2
    my $flag = 0;
    my @pass;
    while (@ARGV) {
        my $key = shift @ARGV;
        if ($key =~ /^MOD_PERL=(\d)$/) {
            $flag = $1;
        }
        else {
            push @pass, $key;
        }
    }
    @ARGV = @pass;

    # check %ENV
    my $env = exists $ENV{MOD_PERL} ? $ENV{MOD_PERL} : 0;

    # check for contradicting requirements
    if ($env && $flag && $flag != $env) {
        die <<EOF;
Can\'t decide which mod_perl version should be used, since you have
supplied contradicting requirements:
    enviroment variable MOD_PERL=$env
    Makefile.PL option  MOD_PERL=$flag
EOF
    }

    my $wanted = 0; 
    $wanted = 2 if $env == 2 || $flag == 2;
    $wanted = 1 if $env == 1 || $flag == 1;

    unless ($wanted) {
        # if still unknown try to require mod_perl.pm
        eval { require mod_perl };
        if ($@) {
            # if we don't have mp2, check for mp2
            eval { require mod_perl2 } if ($@);
            unless ($@) {
                $wanted = 2;
            }
        }
        else {
            $wanted = 1;
        }
    }

    return $wanted;
}


__END__