periodic script not allow configure pgsql user and port
Fix: Patch attached with submission follows:
Over to maintainer (via the GNATS Auto Assign Tool)
back to pool
over to maintainers.
A commit references this bug:
Date: Wed Jan 13 10:36:23 UTC 2016
New revision: 406034
Some binaries where moved from contrib to base in 9.5, like pgbench and
pg_upgrade. Other where added in 9.5, but the port failed to install them.
Make sure they are properly installed by the correct port (-client or -server) 
Remove unused and hence confusing OSSP_UUID parameters from Makefile 
Add options to allow user to be set for the backup script in periodic.
Add this option only to 9.5 for now. It will be updated to other servers at
next regular patch release. 
The path to perl in hard coded into pgxs/src/Makefile.global which is
then installed. Hence, we must depend on perl when that file is installed.
Noticed by: Paul Guyot 
PR: 192387 
PR: 172110 
PR: 206046 
Adding a working variant of the suggested patch to 9.5 now, and will backpatch at next patch release.
Fixed some time ago. Closing the PR.