Re: AC_PROG_INSTALL: require installation of multiple files.

[Eric Blake-1]

> By the way, can I
>   AC_PREREQ(2.61a-341)

Use AC_PREREQ([2.61a-341]), in case a (malicious) user does
m4_define([a],[oops]) prior to using automake macros.

> now in order to be able to assume fixed AC_PROG_INSTALL?
> I mean, it seems to be working, but I haven't checked with
> Autoconf older than 2.59, and I don't know whether the version
> comparison will get things right with the git version and all.

Until my git changes, AC_PREREQ was pretty much unchanged
from autoconf 2.58, and has been exiting with status 63 since
2003.  And while older versions of autoconf are not as robust at
version parsing, they don't need to parse the arbitrary suffix to
correctly determine that they don't meet the prefix of 2.61,
so you will get the desired version-mismatch error.  Git autoconf
will parse into the suffix, but since it handles suffix parsing
correctly, that is not a problem either.  So yes, you are safe
bumping the AC_PREREQ now.

-- 
Eric Blake

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