We have using PostgreSQL 11 in one production server and while creating extension getting below error,please do the needful,
A4.Italy_UAT=# A4.Italy_UAT=# Create extension plperl; ERROR: could not open extension control file "/usr/pgsql-11/share/extension/plperl.control": No such file or directory A4.Italy_UAT=#
You need to install whatever package contains PL/Perl.