plperl fails to install with perl 5.27.11, which is to be released as 5.28.0:
2018-05-17 20:01:44.556 UTC [22629] pg_regress ERROR: 2018-05-17 20:01:44.556 UTC [22629] pg_regress CONTEXT: while running Perl initialization 2018-05-17 20:01:44.556 UTC [22629] pg_regress STATEMENT: CREATE EXTENSION IF NOT EXISTS "plperl" Unfortunately this is all what I could extract from the server log, even log_min_messages = debug5 doesn't print more. Origin: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=899209 Christoph
