Hi,
Debian's reproducible builds project has revealed that the full build
path gets embedded into server/catalog/schemapg.h:
/*-------------------------------------------------------------------------
*
* schemapg.h
* Schema_pg_xxx macros for use by relcache.c
*
* Portions Copyright (c) 1996-2017, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* NOTES
* ******************************
* *** DO NOT EDIT THIS FILE! ***
* ******************************
*
* It has been GENERATED by /build/postgresql-11-05gRdu/build/../src/backend/catalog/genbki.pl
*
*-------------------------------------------------------------------------
*/
This information will vary on rebuilding the binaries, needlessly
causing different checksums.
I'm proposing to strip that down to "It has been GENERATED genbki.pl".
Patch attached.
Christoph