After a C program has started a perl skript and has been 
waiting for it's termination approx. 7000 times some perl 
modules can't be found. 
Two examples:                                                
                                                             
Can't locate XSLoader.pm in @INC (@INC contains: /usr/lib/perl5/5.8.0/i586-linux-thread-multi /usr/lib/perl5/5.8.0 /usr/lib/perl5/site_perl/5.8.0/i586-linux-thread-multi /usr/lib/perl5/site_perl/5.8.0 /usr/lib/perl5/site_perl .) at /usr/lib/perl5/5.8.0/i586-linux-thread-multi/IO.pm line 5.
                                                                                                                                                               
BEGIN failed--compilation aborted at                      /usr/lib/perl5/5.8.0/i586-linux-thread-multi/IO.pm line 5.
                                                         

                                                           
Can't locate IO.pm in @INC (@INC contains: /usr/lib/perl5/5.8.0/i586-linux-thread-multi /usr/lib/perl5/5.8.0 /usr/lib/perl5/site_perl/5.8.0/i586-linux-thread-multi /usr/lib/perl5/site_perl/5.8.0 /usr/lib/perl5/site_perl .) at /usr/lib/perl5/5.8.0/i586-linux-thread-multi/IO/Handle.pm line 256.
                                                           
BEGIN failed--compilation aborted at                     /usr/lib/perl5/5.8.0/i586-linux-thread-multi/IO/Handle.pm line 256.                                                   
                                                            
But all these modules are in @INC and i (as user) can read them so these error messages are wrong!               
What may be the real error and how can i fix it?  
               
nobodyo@web.de