gistfile1.txt

$ autoconf --version
autoconf (GNU Autoconf) 2.68
Copyright (C) 2010 Free Software Foundation, Inc.
License GPLv3+/Autoconf: GNU GPL version 3 or later
<http://gnu.org/licenses/gpl.html>, <http://gnu.org/licenses/exceptions.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.

Written by David J. MacKenzie and Akim Demaille.

$ ls
changes.txt   extra        Makefile.am  readme.md
configure.in  license.txt  platform     src

$ autoconf 
configure.in:6: error: possibly undefined macro: AM_INIT_AUTOMAKE
      If this token and others are legitimate, please use m4_pattern_allow.
      See the Autoconf documentation.
configure.in:8: error: possibly undefined macro: AC_PROG_LIBTOOL

$ ./configure 
configure: error: cannot find install-sh, install.sh, or shtool in platform/unix "."/platform/unix