On Wed, May 24, 2017 at 6:02 AM, hw <hw at gc-24.de> wrote: > > Ah, yes, that does work. Sorry, I guess it was signatures rather > than state. I´m getting > > > Feature "signatures" is not supported by Perl 5.16.3 at ... > > > with CGI scripts. And who knows what else might cause problems. > > The software has been written with perl 5.20.1, which is already > rather old. From perldoc perlsub: Signatures WARNING: Subroutine signatures are experimental. The feature may be modified or removed in future versions of Perl. And according to perldelta the signature syntax did change between 5.20 and 5.24. This is bleeding edge. My perl code is deployed on CentOS, but I also test it on Fedora to ensure an upgrade path. I think you should have a talk with your developers or software vendor about the supported deployment environment and path for perl and system upgrades.