Thank you. Using
use lib "/opt/vcftools/perl";
(here the Vcf.pm can be found) unfortunately doesnt change the behaviour. Have I done a major mistake here?

There is neither the PERL5LIB nor PERLLIB environmental variable. I set it (i am using tcsh), but this also doesnt change the behaviour:



Is it possible, that the PERL process forks and inherits only standard environment variables, forgetting the above introduced ones?

Thanks :)