(autocf21.info.gz) Why GNU m4
12.2 Why Require GNU `m4'?
Why does Autoconf require GNU `m4'?
Many `m4' implementations have hard-coded limitations on the size
and number of macros, which Autoconf exceeds. They also lack several
builtin macros that it would be difficult to get along without in a
sophisticated application like Autoconf, including:
Since only software maintainers need to use Autoconf, and since GNU
`m4' is simple to configure and install, it seems reasonable to require
GNU `m4' to be installed also. Many maintainers of GNU and other free
software already have most of the GNU utilities installed, since they
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