[autotools] Should I worry about "The macro ... is obsolete" and "You should run autoupdate" warnings?

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Wanted to try out the latest 1.10.6 FreeSWITCH release so I updated its build expression (derivation?) and ran

nix-shell -I nixpkgs=~/clones/nixpkgs -p freeswitch`

The compilation process spit out a whole lot of warnings like the ones below, but it did compile successfully.

configure.ac:19: warning: The macro `AC_CONFIG_HEADER' is obsolete.
configure.ac:19: You should run autoupdate.
./lib/autoconf/status.m4:719: AC_CONFIG_HEADER is expanded from...
configure.ac:19: the top level
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Nix/Os tends to be updated quicky, and uses quite new tools. This is warning, and the build code needs updating/refactoring to use newer Autotools standards.

https://lists.gnu.org/archive/html/autotools-announce/2020-12/msg00001.html

says…

*** AC_CONFIG_HEADER is now diagnosed as obsolete, and replaced with
    AC_CONFIG_HEADERS by autoupdate.

  This macro has been considered obsolete for many years and was not
  documented at all.

but like all code, it remains,…for ever. This is an issue that needs to be fixed upstream at some point , if it still maintained.

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