1) Build automation 2) Computer configuration 3) Free computer library
Found on
https://www.crosswordclues.com/clue/autoconf
GNU Autoconf is a tool for producing configure scripts for building, installing and packaging software on computer systems where a Bourne shell is available. Autoconf is agnostic about the programming languages used, but it is often used for projects using C, C++, Fortran, Fortran 77, Erlang or Objective-C. A configure script configures a software...
Found on
http://en.wikipedia.org/wiki/Autoconf
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