First, look at documentation
http://drupal.org/handbook/modules/ldap_integration
Next, download the right module for your Drupal version
http://drupal.org/project/ldap_integration
For me it was ldap_integration-6.x-1.0-beta1.tar.gz
Expand compressed package, unpack archive

gzip -d ldap_integration-6.x-1.0-beta1.tar.gz
tar -xvf ldap_integration-6.x-1.0-beta1.tar

Move ldap module into drupal. Assuming tar file was expanded in drupal folder, simply
mv ldap_integration modules
Now we go to Drupal=>Administer->Site Building->Modules
Scroll down to bottom, enable LDAP Authentication. Optionally [...]

Perl module Device::SerialPort is our friend.
As is Clipboard, IO::All, Spiffy
Trying to talk to a Sartorius precision balance. Speaks over Serial/USB cable.
Dang, there was supposed to be more here to serve as documentation. Now, months later, I have forgotten it all…
Here is at least the shell of the code:

#!/usr/bin/perl
use Data::Dumper;
use DBI;
use Device::SerialPort;
use Time::HiRes qw(usleep);
use CGI;
$query=new CGI;
print [...]