[sr #111044] autoconf should assert existence of all subsidiary tools at startup

Follow-up Comment #3, sr #111044 (group autoconf):

[comment #2 comment #2:]
> neither `diff` nor `awk` (and arguably not even `sed`) should be an implicit
dependency.

Not sure I'd go that far. The
[https://www.gnu.org/prep/standards/html_node/Utilities-in-Makefiles.html GNU
Coding Standards for utilities in makefiles] lists the following as usable
without further ado:

awk cat cmp cp diff echo egrep expr false grep install-info ln ls
mkdir mv printf pwd rm rmdir sed sleep sort tar test touch tr true


Although some of these are debatable (egrep is no longer required by POSIX and
people should use 'grep -E', install-info is needed only if using info) it's
not a bad list of utilities that should work everywhere. I'd hate for Autoconf
to have to worry about platforms lacking 'rm'....


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