If Autoconf requires GNU M4 and GNU M4 has an Autoconf
configurescript, how do I bootstrap? It seems like a chicken and egg problem!
This is a misunderstanding. Although GNU M4 does come with a
configure script produced by Autoconf, Autoconf is not required
in order to run the script and install GNU M4. Autoconf is only
required if you want to change the M4
configure script, which few
people have to do (mainly its maintainer).