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    $wanted ||= $self->_wanted_mp_generation();

    unless ( $wanted == 1 || $wanted == 2 ) {
        die "don't know anything about mod_perl generation: $wanted\n"
          . "currently supporting only generations 1 and 2";
    }

    my $selected = 0;

    if ( $wanted == 1 ) {

        eval { require mod_perl };
        if ($@) {
            warn("require mod_perl failed");
            return;
        }

        $selected = 1;
    }
    elsif ( $wanted == 2 ) {

        eval { require mod_perl2 };
        if ($@) {
            warn("require mod_perl2 failed");
            return;
        }

        $selected = 2;
    }
    else {

        # try mp2 first
        eval { require mod_perl2 };
        if ($@) {
            warn("require mod_perl2 failed");

            eval { require mod_perl };
            if ($@) {
                warn("require mod_perl failed");
                return;
            }
        }

        $selected = $mod_perl::VERSION >= MIN_MP2_VER ? 2 : 1;
    }

    # make sure we have the needed build modules
    my $build_pkg =
      ( $selected == 2 ) ? 'ModPerl::BuildMM' : 'ExtUtils::MakeMaker';
    eval "require $build_pkg";
    die "could not require package $build_pkg: $@" if $@;

    $self->{maker} = $build_pkg;

    return $self->{mp_gen} = $selected;
}

# _wanted_mp_generation()
#
# 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

# Currently the logic for determining the mod_perl generation
# is as follows.

# If a specific generation was passed as an argument,
#     if satisfied
#         return the same generation
#     else
#         die
# else @ARGV and %ENV will be checked for specific orders
#     if the specification will be found
#         if satisfied
#             return the specified generation
#         else
#             die
#     else if any mp generation is found
#              return it
#           else
#              die

sub _wanted_mp_generation {
    my $self = shift;

    # check if we have a command line specification
    # flag: 0: unknown, 1: mp1, 2: mp2
    my $flag = 0;
    foreach my $key (@ARGV) {
        if ( $key =~ /^MOD_PERL=([12])$/ ) {
            $flag = $1;
        }
    }

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

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

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