I am trying to configure authentication by OpenID in lemonldap::ng with this When I try http://auth.example.com/openidserver/username, I see following error: Unable to load Net::OpenID::Server Base class package "Net::OpenID::Server" is empty. (Perhaps you need to 'use' the module which defines that package first, or make that module available in @INC (@INC contains: /usr/local/lib64/perl5 /usr/local/share/perl5 /usr/lib64/perl5/vendor_perl /usr/share/perl5/vendor_perl /usr/lib64/perl5 /usr/share/perl5 . /etc/httpd). at /usr/share/perl5/vendor_perl/Lemonldap/NG/Portal/OpenID/Server.pm line 9 BEGIN failed--compilation aborted at /usr/share/perl5/vendor_perl/Lemonldap/NG/Portal/OpenID/Server.pm line 9, line 522. Compilation failed in require at /usr/share/perl5/vendor_perl/Lemonldap/NG/Portal/IssuerDBOpenID.pm line 40, line 522. LemonLDAP::NG Lemonldap::ng works in CentOS 6.4 and server have all update's