Autotools is a set of programming tools that are used to make a source code package portable to a range of systems, including UNIX and others. It is widely used in various open source packages and free software.
Autotools is also known as the GNU Build System.
Autotools find wide applications when a software program is to be made portable to a range of coding environments. For example, if a certain C language code is not portable on a different environment as certain files are missing, Autotools can manage this efficiently with the help of various tools like autoconf, automake, aclocal and others. Autoconf is used to develop the configure script, while automake is used to develop makefile in templates.