Thanks for your reply. Here is information about my Linux system, the Perl version I use and my gcc: mws@allegro:~$ uname -a Linux allegro 3.2.0-4-amd64 #1 SMP Debian 3.2.54-2 x86_64 GNU/Linux mws@allegro:~$ perl --version This is perl 5, version 14, subversion 2 (v5.14.2) built for x86_64-linux-gnu...