Perhaps you should have shown some code.
If you're doing something like

  $ENV{'LD_LIBRARY_PATH'} = '/...';
  use XML::LibXML;
[download]

then the problem may be that the envar isn't getting set until after the library gets loaded. In which case, try

  BEGIN { $ENV{'LD_LIBRARY_PATH'} = '/...'; }
  use XML::LibXML;
[download]

jdporter
The 6th Rule of Perl Club is -- There is no Rule #6.