Autoconf was failing to detect install-sh at the top level and needed
some explicit directions. It also wants config.guess and config.sub to
be provided too.
A few other macros have also been updated.
File locations can be customized via './configure'. 'make install'
does not work yet. Options for wizard mode and load checks may not do
what is intended.
Fun fact: there's an enlightening epigraph in the introduction to the
autoconf manual.
