Trying to build Firefox on Android by referring to this page. Simple Firefox for Android build
However, the build command ./mach build fails with the error
ERROR: Could not find autoconf 2.13
However autoconf is already installed on the system.
$ autoconf --version
autoconf (GNU Autoconf) 2.69
Copyright (C) 2012 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.
Here's the pastebin of the error.
Thanks.