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From: Glenn Morris <rgm@gnu.org>
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Subject: Re: Master HEAD build failure?
Date: Wed, 29 Sep 2021 21:23:56 -0400
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To: Tim Cross <theophilusx@gmail.com>
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Tim Cross wrote:

> make[3]: Entering directory '/home/tim/git/emacs/lisp'
[...]
> desired fingerprint:
> 85f312322694a812c6415eae9aea6afbbc20b2924e0617f410218006e1fc48c8
> found fingerprint:
> 2db1c43551c18cfe037e9db53b353bb37add978d1134069ed31ee14138e7d2fc
> emacs: could not load dump file
> "/usr/local/libexec/emacs/28.0.50/x86_64-pc-linux-gnu/emacs.pdmp": not
> built for this Emacs executable

A build failure is a bug and should be reported as such.
Anyway, the problem is that the build is finding a previously installed
pdmp file in preference to the one in the build tree.
(I feel like this was reported before.)
Using the fingerprint in the pdmp name would avoid this, but there has
been no progress on this (bug#42790).