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use ExtUtils::MakeMaker;
use lib 'inc'; # load our bundled version of Devel::CheckLib
use Devel::CheckLib;

my %bigint_preq;

if ( check_lib(lib => 'gmp', header => 'gmp.h') ) {
  # GMP found.  Life is *good*.
  %bigint_preq = (
                      'Math::BigInt::GMP'      => 0,
                      'Math::Prime::Util::GMP' => 0,
                 );
} elsif ( check_lib(lib => 'pari', header => 'pari/pari.h') ) {
  # Pari found.  Slower than GMP in this application, but still adequate.
  %bigint_preq = (
                      'Math::BigInt::Pari'     => 0,
                 );
} else {
  # Yech, no big int libraries found.
  print <<EO_BIGINT;
 

 **********************************************************
 *
 * Building without GMP or Pari support.
 *
 * Operations will be very slow.
 *
 * Strongly consider installing GMP and Math::BigInt::GMP.
 *
 **********************************************************
EO_BIGINT
}

WriteMakefile1(
    NAME         => 'Alt::Crypt::RSA::BigInt',
    ABSTRACT     => 'RSA public-key cryptosystem, using Math::BigInt',
    VERSION_FROM => 'lib/Alt/Crypt/RSA/BigInt.pm',
    LICENSE      => 'perl',
    AUTHOR       => 'Dana A Jacobsen <dana@acm.org>',

    BUILD_REQUIRES=>{
                      'Test::More'       => '0.45',
                      'Benchmark'        => 0,
                      'MIME::Base64'     => 0,
                    },
    PREREQ_PM    => {
                      'Math::BigInt'           => '1.78', # try => backend
                      'Math::Prime::Util'      => '0.64', # built in csprng
                      'Carp'                   => 0,
                      'Exporter'               => 0,
                      'Crypt::CBC'             => '2.17',
                      'Crypt::Blowfish'        => 0,
                      'Data::Dumper'           => 0,
                      'Tie::EncryptedHash'     => 0,
                      'Convert::ASCII::Armour' => 0,
                      'Sort::Versions'         => 0,
                      'Digest::SHA'            => 0,
                      'Digest::MD5'            => 0,
                      'Digest::MD2'            => 0,
                      'Class::Loader'          => 0,
                      'Data::Buffer'           => 0,