+cc config-patc...@gnu.org, Ben Elliston <b...@air.net.au>

> IME, it is much better when any override mechanism make use of
> environment variables.

Yes, it was mentioned multiple times in this thread already and it was
always forgotten.  Please consider this approach.

One thing was not mentioned here - if there was a CONFIG_GUESS/CONFIG_SUB
environment variables, what would be the consequences of having it solved
directly in config.{guess,sub} files?
I mean, if there was defined CONFIG_GUESS environment variable, the
config.guess could try to call 'config.guess' file somewhere in $PATH?

pros: we are able to easily patch also old packages (no-need to
autoreconfigure)

Pavel


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