Install autoconf by entering the following commands in the terminal:
sudo apt update sudo apt install autoconf
automatic configure script builder
The standard for FSF source packages. This is only useful if you write your own programs or if you extensively modify other people's programs. . For an extensive library of additional Autoconf macros, install the `autoconf-archive' package. . This version of autoconf is not compatible with scripts meant for Autoconf 2.13 or earlier.