[snip]
amcheck was not part of the Postgres source tree until v10.It might exist in some form for 9.6, but you'd have to look outside the standard distribution channels
amcheck_next96 binary RPM were absolutely distributed by download.postgresql.org/pub/repos/yum/9.6/redhat/rhel-6.
I downloaded amcheck_next96-1.4.1 when I downloaded 9.6.22, but did not download amcheck_next96-1.4.5 with 9.6.24.
If push comes to shove, I can probably install the 1.4.1 RPM along side 9.6.24.
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Born in Arizona, moved to Babylonia.
Born in Arizona, moved to Babylonia.